题目内容


Scientists ______ SARS for several months before a major discovery was made in the field.
A．had been studyingB．have been studying
C．have studiedD．are studying
A
略
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Water as well as other resources ______ all over the world every day.
A．is wastedB．are wastedC．wasteD．wastes
He _____ the cooking yesterday.
A．didB．madeC．tookD．had
Indeed,thanks to the good ideas of lots of people,like the cycling fans in the 1960s,many people around the world______the city centre streets without cars for many years.
A．have enjoyedB．enjoyedC．have been enjoying D．have been enjoyed

The price_________recently. I wonder whether it will remain so.
A．was going upB．went upC．has gone upD．has been going up

Jack_____his leg. Otherwise, he would have won the race.
A．had brokenB．brokeC．has brokenD．would break
About 71% of the earth’s surface ______ covered with water, but 20% of the world population ______ have access to safe drinking water.
A．is; doesn’t B．are; don’t C．are; doesn’t D．is; don’t

These monkeys are such quick thieves that they________your bananas when you realize what has happened.
A．will enjoyB．are enjoyingC．have been enjoyingD．will be enjoying
The door       ．Better have it repaired．
A．won’t shutB．hasn’t been shutC．won’t be shutD．isn’t shut

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