I won’t tell the student the answer to the math problem until he on it for more than an hour.A．has been workingB．will have workedC．will have been workingD．had worked 题目和参考答案——青夏教育精英家教网—

题目内容

I won’t tell the student the answer to the math problem until he ________ on it for more than an hour.

A．has been working

B．will have worked

C．will have been working

D．had worked

略

练习册系列答案

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You must put your heart into what you are doing, or you ________ your aim.

A．never achieved	B．will never achieve
C．have never achieved	D．are never achieving

Some teenagers _______ their health because they often expose themselves to so many electric products.

－How long have you been at home?
－Half an hour. My son _________ me home.

There aren’t many seats left for the play; you had better make sure that you two today.

The basin _______ water soon. You can’t pour more in.

Come nad see me whenever _____________.

A．you are convenient	B．you will be convenient
C．it is convenient to you	D．it will be convenient to you

He ___ his leg when he __ in a football match against another school.

A．broke, played

B．was breaking, was playing

C．broke , was playing

D．was breaking, played

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