单项选择题

Encouragement is sometimes much more _____ than criticism.

A．effective　 　　　
B．efficient　
C．executive　
D．extensive
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单项选择题
Don’t worry me now, I will mend that coat _____.
A．by and by　
B．off and on　
C．back an forth　
D．now and then
单项选择题
You may depend on ____ will not repeat his mistakes.
A．it that　
B．that　
C．him that　
D．which that
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