B. saves
C. had saved
D. has saved
[解析]句意:迄今为止,这个项目已经救了好几千名孩子。如果没有这项工程,这些孩子早就死了。up to now 相当于 by now,要与现在完成时连用。
[答案]D
39.(2010·天津)We ________ on this project for four hours. Let's have a rest.
A. are working
B. have been working
C. worked
D. had worked
[解析]句意:我们已经连续做这个工程四个小时了,休息一下吧。根据语境中“休息一下吧”可知工作尚未完成,又结合题干中的 for four hours, 可推知设空处应该用现在完成进行时态。
[答案]B
40.(2010·上海)Every few years, the coal workers ________ their lungs Xrayed to ensure their health.
A. are having
B. have
C. have had
D. had had
[解析]句意:每隔几年,煤矿工人们都要对肺部进行X光检查,以确保身体健康。根据 every few years (每隔几年)可知动作是经常性的,有规律的,所以用一般现在时。
[答案]B
模拟精选
1.(2017·海淀区期中)—I'm trying to find yesterday's newspaper. Have you seen it?
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