单项选择题

She （） not have seen you yesterday, for she was not there.

A. might
B. could
C. should
D. must

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The driver carefully checked his car （） it should go wrong on the way.

A. lest
B. or else
C. so that
D. in order that
单项选择题
Only after a baby seal is pushed into the sea by its mother （） to swim.

A. how will it learn
B. will it learn how
C. it will learn how
D. and it learns how
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