一些有关英语的问题,
1.doubt后面的宾语从句什么时候接that ,whether.
2._____i understand what you say ,i cannot agree with you.
A.when B.while
正确答案选B,为什么呢
3.the scientists are confused as to ___they should call the animal ,which looks half-animal.
A.that B.why C.who D.what
正确选D,为什么?