题目内容
选择填空:
He didn't notice us ______ in the classroom at that time.
[ ]
A. study B. were studying
C. to study D. to studying
答案:A
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题目内容
选择填空:
He didn't notice us ______ in the classroom at that time.
[ ]
A. study B. were studying
C. to study D. to studying