— Have you ever visited the Opera House? —Yes．When I was in Sydney, I ______ it

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— Have you ever visited the Opera House?
—Yes．When I was in Sydney, I ______ it twice．

A．have visited	B．visited
C．had visited	D．would visit

答案

解析

略

举一反三

It is the first time that a developing country _______ the Expo, described as the Olympic Games of economy, science and technology．

A．is hosting

B．has hosted

C．hosts

D．will host

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The earthquake in Yushu _______ roughly one month before the second anniversary of the earthquake in Wenchuan.

A．was happened	B．had happened
C．happened	D．had been happened

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He was working quietly, with all his attention _______ on the task.

A．was fastened

B．fastening

C．to fasten

D．fastened

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When and where to build the new factory_______- not yet decided yet.
A. is B are C. has D. have

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The injures from Yushu earthquake are in different hospitals. Right now they ______ carefully.

A．are treating

B．are being treated

C．have treated

D．have been treated

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