单项选择题

"That must be a mistake." No, it () a mistake."

A. must not be
B. needn’t be
C. can’t be
D. would not be

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单项选择题
The real trouble ()their lack of confidence in their abilities.

A. lies on
B lies in
C. results in
D. leads to
单项选择题
——if he (), he () that food. ——Luckily he was sent to the hospital immediately.

A. was warned; would not take
B. had been warned; would not have taken
C. would be warned; had not taken
D. would have been warned; had not taken
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