问题描述：
Although the boy studies very hard,___he can't do well in all his subjects.
A.but B.and C.yet D.so
是不是B?
It ____two years since I came here.
A.is B.has been C.was D.A and B
是选A还是B还是D?
A.but B.and C.yet D.so
是不是B?
It ____two years since I came here.
A.is B.has been C.was D.A and B
是选A还是B还是D?
问题解答：
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