单项选择题

They'll take()trip to Jiangxi tomorrow.

A.a two-day
B.a two-days
C.a two day's
D.a two day

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单项选择题

() he tried, he was unable to work out this mathematic exercise.

A.As hard
B.Hard when
C.Hard as
D.When hard

单项选择题

I'm moving to the countryside because the air there is much fresher than () in the city.

A.ones
B.one
C.that
D.those

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