请说明选择的理由,
1.I had a hard time ______ the key.
A.find B.finds C.finding D.found
2.—Tom plays the violin very well,doesn’t he?—______.
A.He plays it B.He thinks so C.He sure does D.He agrees
3.—Which park are you going to?—______.
A.Good idea B.I’m going to Nanhu Park C.I won’t,either D.It’s too crowded