.It is said that the early European playing-cards ______for entertainment and ed

题型：不详难度：来源：

.It is said that the early European playing-cards ______for entertainment and education.

A．were being designed

B．have designed

C．have been designed

D．were designed

答案

解析

略

举一反三

Years ago we didn’t know this , but recent science______that people who don’t sleep well soon get ill.

A．showed

B．has shown

C．will show

D．is showing

题型：不详难度：| 查看答案

– I have got a headache.
--No wonder. You ___in front of that computer too long.

A．work

B．are working

C．have been working

D．worked

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Leaders of the BRIC countries-----Brazil, Russia, India and China----_______their second summit on Friday. President Hu Jintao then returned home to help direct relief work ______the deadly earthquake in Qinhai.

A．left, to follow	B．concluded, following
C．had left, following	D．had concluded, followed

题型：不详难度：| 查看答案

Every possible means _______to prevent the air pollution, but the sky is still not clear.

A．are being used

B．have been used

C．has been used

D．had been used

题型：不详难度：| 查看答案

I ______ on a sofa because my grandparents have come for the weekend.

A．slept

B．was sleeping

C．have slept

D．am sleeping

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