单选题
13.
It was three weeks later ______ I knew I had made a mistake.
A、
where
B、
that
C、
before
D、
when
【正确答案】
B
【答案解析】
[考点] 强调句
如果把it was去掉，此句为Three weeks later I knew I had made a mistake句子仍然成立，所以该句为it is...that...强调句。句意为：三周后我才知道自己犯了个错。
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