单项选择题

All her hard work ______ in the end, and she finally passed the exam.

A．showed off
B．paid off
C．left off
D．kept off
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单项选择题
The opportunity to explore and play and the encouragement to do so can ______ the performance of many children.
A．withhold
B．prevent
C．enhance
D．justify
单项选择题
Successful learning is not a(n) ______ activity but consists of four distinct stages in a specific order.
A．only
B．sole
C．mere
D．single
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