Laughter, along with an active sense of humor, ______ protect you against a hear

Laughter, along with an active sense of humor, ______ protect you against a hear

题型:不详难度:来源:
Laughter, along with an active sense of humor, ______ protect you against a heart attack, according to a recent study.
A.have helpedB.helpedC.helpD.helps

答案
D
解析

试题分析:本句的主语是laughter,和后面的an active sense of humor没关系,故谓语动词使用单数形式。句义:根据最近的一项调查,笑声和幽默感可以帮助保护我们不受心脏病的攻击。本句中没有出现过去时的时间状语,而且是对经常性的事情的说明,故D正确。
举一反三
—If he______there were poisonous snakes in the mountain, he would not have camped there.
—Luckily, he was found relatively quickly and_______to the local medical center.
A.was reminded; rushedB.had been reminded; rushed
C.was reminded; rushingD.had been reminded; rushing

题型:不详难度:| 查看答案
Do you think that bridge _________2,000 metres long? It doesn’t appear so long.
A.measuresB.is measuredC.has been measuredD.is measuring

题型:不详难度:| 查看答案
By the time Jack returned home from England, his son  _______  from college.
A.graduatedB.has graduatedC.had been graduatingD.had graduated

题型:不详难度:| 查看答案
Yangzhou high school ___________ since 1902. 
A.has come into existenceB.has been existedC.has been in existenceD.began to exist

题型:不详难度:| 查看答案
A new kind of drug ___ ___ to cure H7N9 bird flu by the scientists and they are hopeful that they will succeed in a couple of weeks.
A.has been developedB.is being developedC.is developingD.has developed

题型:不详难度:| 查看答案
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