单项选择题

It was not until he entered the classroom ______ he realized that he had forgotten to do the homework.

A. before
B. when
C. then
D. that
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单项选择题
He came to inspect the house ______ buying it.
A. in the event of
B. with a view to
C. on account of
D. with reference to
单项选择题
I'll come ______ John is invited, too.
A. on condition that
B. in condition that
C. in the circumstances that
D. in case that
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