单项选择题

Mry is so wet. She _______ in the rin.must be cughtB．must hve been cughtC．should hve been

cMry is so wet. She _______ in the rin.must be cught B．must hve been cught C．should hve been cught D．cn hve been cughtA．must be caughtB．must have been caughtC．should have been caughtD．can have been caught

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单项选择题

下面的字不属于左右结构的是（）。

A、树
B、清
C、祝
D、请

单项选择题

They _________ the plne, or perhps they hve been prevented from coming for some reson.cn h

veThey _________ the plne, or perhps they hve been prevented from coming for some reson.cn hve missed B．cn hve lost C．my hve missed D．my hve lostA．can have missedB．can have lostC．may have misseD．may have lost

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遏止电势差和频率的成线性关系