单项选择题

Courage, intelligence, and experience all ______ overcome obstacles.

A．helps
B．helping
C．help
D．helped
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单项选择题
Jerry seldom came to the laboratory, ______ he
A．did he
B．didn't he
C．does him
D．doesn't he
单项选择题
It is five years ______ he left his hometown.
A．when
B．from
C．since
D．while
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