ScientistsSARSforseveralmonths

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Scientists ______ SARS for several months before a major discovery was made in the field.

A．had been studying	B．have been studying
C．have studied	D．are studying

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相关试题

Come and visit me whenever _______.

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

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---Will Tony come to the party tonight?
---I’m not sure. He _______stay at home preparing for the coming exam.

A．must

B．might

C．can

D．need

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The house I grew up _______ has been pulled down and replaced by a hospital.

A．in it

B．in

C．in that

D．in which

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______ the project in time, the staff have been working at weekends since last summer.

A．Completing

B．Having completed

C．To have completed

D．To complete

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---Why do you keep looking back?
---I have a feeling that we _______.

A．were followed

B．have been followed

C．are being followed

D．are following

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