条件状语从句的问题______he is diligent in his studies at ordinary tim

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条件状语从句的问题
______he is diligent in his studies at ordinary times,he is sure to pass the test.
A.Assuming
B.Since
C.As
D.When
此题的答案是选A,但是我觉得B也行,从词意上来看也解释的过去,那为什么不能选B呢?如果要选B,则句子应该改成怎样呢?

since一般和现在完成时和过去完成时一起用 since he has been diligent in his…

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