问题

Not until they left school ______ how much their teachers loved them and helped them. [ ]

A: they realized
B: had they realized
C: they would realize
D: did they realize

正确答案是：

同类题型

ympic Games，________in 776 BC, did not include women players until 1912

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“I think the teacher is wrong, _____?” ——“No, I don’t think so.”

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