单项选择题

Try your best, （）you’ll certainly succeed this time.

A. so
B. and
C. or
D. for

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单项选择题
It’s a fine day, Let’s go fishing, （）

A. won’t we
B. will we
C. don’t we
D. shall we
单项选择题
What we have seen is （）

A. from what we heard
B. all what we heard
C. to what we have heard
D. from what we have heard
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