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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A. is; talking; has told
B. will; talk; tells
C. has; talked; told
D. had; talked; told -
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"None of them need do any work today, （） they" "Yes, all of them（）
A. needn't; need
B. mustn't; must
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A. was shown
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C. showed
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