问题
选择题
There is no doubt that he is a good professor__________he is doing fine.
A．but
B．because
C．so
D．yet
答案
B
because引导原因状语从句，意思是：他干得很好。
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There is no doubt that he is a good professor__________he is doing fine.
A．but
B．because
C．so
D．yet
B
because引导原因状语从句，意思是：他干得很好。