单选题
It was not until she arrived at the classroom
she realized
she had forgotten her coursebook.
A、
and she realized
B、
which she realized
C、
then she realized
D、
that she realized
【正确答案】
D
【答案解析】
[解析] 本题考查固定结构的用法。it was not until...that. 为固定用法，意为“直到……才……”，符合题意。所以，答案是D。
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