单项选择题

The chair ______ you are sitting is made of wood.

A．that
B．which
C．what
D．on which
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单项选择题
Courage, intelligence, and experience all ______ overcome obstacles.
A．helps
B．helping
C．help
D．helped
单项选择题
Time ______, I shall invite you to dinner tonight.
A．permitted
B．that permitting
C．is permitted
D．permitting
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