单选题
The mason ______ I didn't do this exercise is I didn't know how to do it.
A、
why...because
B、
why...that
C、
for...that
D、
that...because
【正确答案】
B
【答案解析】
本题考查固定句型，侧重点是考查the reason why．．．that的用法。关键是掌握固定句型： The reason + why从句(或+for短语)+is that从句。
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