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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单项选择题

() send your motorcycle to be repaired You'd better not drive it any more.

A．Wily
B．Why not
C．Why don't
D．Why didn't

单项选择题

— 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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