A-A+
It was not until he entered the classroom ____
问题详情
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
参考答案
正确答案：D
解析：此句使用了强调句型，即It is (was)... that....
考点：
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