单项选择题

______ do we go for picnics.()

A. Certainly
B. Seldom
C. Sometimes
D. Once

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单项选择题
If you don't put the cheese. in the refrigerator, it may ______.()

A. go at
B. go off
C. go on
D. go back
单项选择题
The rest of his life is () to the cause of international exchange of visiting scholars.()

A. added
B. put
C. saved
D. committed
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