单项选择题

Mandela was first President elected in South Afric

A．A. a; theB. the; xC. a; xD. the; the

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单项选择题

I'm not leaving ______ I get an apology from you.

A．so that
B．as long as
C．while
D．until

单项选择题

I need ______ to finish the chair.

A．one more wood
B．much woods
C．many woods
D．a piece of wood

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