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

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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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— Is Paul playing both soccer and tennis for the school — He (). But now he has given up playing tennis.

A.is
B.has
C.was
D.had
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