单选题It was _____ it raised many difficult questions that the book took a long time to come out.AsinceBbecauseCafterDwhen

单选题
It was _____ it raised many difficult questions that the book took a long time to come out.
A

since

B

because

C

after

D

when


参考解析

解析:
此题考查强调结构,强调的是原因状语。故选B。

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