（Although) i can't (concur in) the speaker's opinions,I am graceful for the opportunity (to haver heard) (them) expressed so eloquently.
答案是B,换成concur with the speaker in the opinions,to have heard them 作定语 修饰机会 动作已发生过 故用完成式
Greta Garbo,the sensational and talented Hollywood star off the (1930s),became a recluse for most of her adult life and (remained) isolated but (looking) (beautifully) until the day she died.
答案是D,我知道D错了,应该用形容词作动名词looking的表语 LOOKing是 remained 的并列表语 与主语 是主表关系off the 1930s,o早在30年代
(As) Katie opened the refrigerator,she instantly noticed that a huge chunk of chocolate icing had been (bit) (off) the birthday cake and immdiately suspected that Mark was responsible.
答案是B.bite 的过去分词 是bitten 不过 bit 也可以 当过去分词用啊
Africa's Kanem empire,after (enduring for) over a thousand years,(is) believed to have fallen (into decline) when trade centers (shift) outside its boundaries
A for是介词 over这里是副词 是超过的意思 不重复
答案D.动词时态不对 改为过去时 是动词不定式的 时间状语
The museum,which (has sponsored) free programs in the arts for city children since the late 1960s,was (cited) (by the mayor) for （their） many civic contributions .我选了C,答案D,为什么改成MAYORS我认为答案 是 E THEIR 应改为 its
(It was) a Chinese Americian grower who finally succeeded (with adapting） the (now familiar) prange tree (to) the Amercian climate.
答案B,把 with 改为 in succeed in doing
When Doris Lessing punlished The Golden Notebook in 1962,(it) (instantly established) her-self (as one) of the (most important) literary voices of her generation.
答案A.应改为she
（Being） lost in the mountains of Colorado for two days （as a boy）,Dave is (always careful) to take detailed map with him when he sets out for a backpacking adverture in the wilderness.
答案A.把being去掉 for 一段时间,并非 只用于 完成时
The threat 是主语 后面是定语(which suspends) students (caught) using cell phones during class without permission seems 是系动词 后面是表语(like) an over-reaction to the problem (because) the principal is ordinarily sensitive and level-headed.
这道题做对了,答案是A CAUGHT是过去分词作定语 供参考