He works as an engineer now, but he _______ on a farm for three years.A．has work

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He works as an engineer now, but he _______ on a farm for three years.

A．has worked

B．worked

C．was working

D．had worked

答案

解析

略

举一反三

In Japan when we spent the night at a small country inn, we ________ so low on the floor before.

A．haven’t ever slept	B．wouldn’t have slept
C．hadn’t ever slept	D．couldn’t have slept

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.Yang Liwei as well as the other two astronauts _______ to be the most qualified for space exploration.

A．considered

B．had considered

C．was considered

D．were considered

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Because of global warming, the ice that polar bears depend on for survival _______.

A．are slowing disappearing	B．is slowly disappearing
C．are slowly disappeared	D．have slowly disappeared

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-- Isn"t it amazing that I met Francis at the Christmas party?
-- Really? For how many years ________each other?

A．didn"t you see

B．haven"t you seen

C．don"t you see

D．hadn"t you seen

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All of you ____ at the school gate! We’ll soon start.

A．are gathering

B．will gather

C．have gathered

D．gather

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