Thepasttwoyearsasharpriseinoil

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The past two years ________ a sharp rise in oil price, which adds to the burden of auto transportation industry.

A．witnessed

B．has witnessed

C．is witnessing

D．witnesses

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.In this experiment, they are woken up several times during the night, and asked to report what they＿＿＿＿.

A．had just been dreaming	B．are just dreaming
C．have just been dreaming	D．had just dreamt

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When he was alive, the old scientist used to say that knowledge ＿＿＿＿from practice and he gained his experience by doing a lot of practical work.

A．was coming

B．had come

C．comes

D．would come

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He ＿＿＿articles for our wall-newspaper these three years, and he ＿＿＿about forty articles.

A．has been writing； has written	B．has been writing； wrote
C．is writing； has been writing	D．has written； has written

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The children ＿＿＿＿＿＿ very quiet； I wonder what they ＿＿＿＿up to.

A．were； are being

B．are being； are

C．are； do

D．are being； do

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Jim talked for about half an hour yesterday.Never＿＿＿＿＿ him talk so much.

A．I heard

B．did I hear

C．I had heard

D．had I heard

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