2.AIDS is said________the biggest health challenge to both men and women in that area over the past few years.
A.that it is B.to be
C.that it has been
D.to have been
解析:选D。句意:据说,在过去的几年中,艾滋病对于那个地区的男女来说已是最大的健康挑战。It is said that从句可转换为Sb./Sth.be said to do/to be doing/to have done的形式。由此可淘汰A、C两项,由句子中的时间状语over the past few years可知要用完成时,所以淘汰B项,故选D。
3.The flu is believed________by viruses that like to reproduce in the cells inside the human nose and throat.
A.causing
B.being caused
C.to be caused
D.to have caused
解析:选C。考查特殊句式。句意:人们认为感冒是由喜欢在人的鼻子和喉咙的细胞中自我复制的病毒引起的。本句是“It’s believed that the flu is caused by viruses that like to reproduce in the cells inside the human nose and throat.”的另外一种表达形式。
Ⅲ.语法专练
本单元语法——现在完成时的被动语态
1.(2016·唐山市调研)—Flight 302 to Paris________until 7∶30 tomorrow morning.
—No wonder I hear so many complaints from the passengers.
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