单项选择题

Courage, intelligence, and experience all（）to overcome obstacles.

A、 helps
B、 helping
C、 help
D、 helped

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单项选择题

The chair（）you are sitting is made of wood.

A、 that
B、 which
C、 what
D、 on which

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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