单项选择题

______ and under no circumstances will China be the first to use nuclear weapons.

A. At times
B. At a time
C. At all times
D. At no time
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单项选择题
I felt like （）to him, Don't be such a complainer all the time.

A. say
B. saying
C. to be said
D. to say
单项选择题
I don't know about him, （）comment on him behind his back.

A. let alone
B. let go
C. leave alone
D. take leave
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