单项选择题

A big dog ran in front of my mother's car and she（） stop very quickly.

A. ought to
B. had better
C. must
D. had to

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单项选择题
The boss （） already （） with the woman, who （）him her plan.

A. is; talking; has told
B. will; talk; tells
C. has; talked; told
D. had; talked; told
单项选择题
None of them need do any work today, （） they Yes, all of them（）

A. needn't; need
B. mustn't; must
C. need; needn't
D. need; must
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