It was so quiet in the classroom that a needle _____to drop onto the floor. [ ]A. could hear B. was to be heard C. could have been heard D. must be heard -高中英语-n多题

◎ 题干

It was so quiet in the classroom that a needle _____ to drop onto the floor.

[ ]

A. could hear
B. was to be heard
C. could have been heard
D. must be heard

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◎ 解析

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◎ 知识点

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