单项选择题

（） of the earth’s surface is covered with water.

A．Two-third
B．Second-thirds
C．Second-third
D．Two-thirds

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单项选择题

Iturnedtomycoachforinformationonswimmingskills,butgot（）ashewasaway.

A．few
B．some
C．none
D．much

单项选择题

IwillneverforgetMary,（）Isawheronlyonce.

A．though
B．before
C．while
D．as

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