单选题
4.
It was not until midnight ______ he finished his homework.
A、
when
B、
that
C、
while
D、
as
【正确答案】
B
【答案解析】
[考点] 强调句
it was...that (who)是强调句型。此题可还原为He didn't finish his hornework until midnight.句意为：他直到午夜才完成作业。
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