Do you think the reason ______ he gave is believable?

A.for which

B.which

C.why

D.what

答案及解析： B

解析：

先行词和the reason在定语从句he gave中作宾语，故排除A、C、D三项。what不可引导定语从句。不要由于思维定式的缘故而立刻选择why引导定语从句。