We cannot always______the wind, so new windmills should be so designed that they can also be driven by water.

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问题 We cannot always______the wind, so new windmills should be so designed that they can also be driven by water.

选项 A、hang on
B、count on
C、hold on
D、come on

答案B

解析 这是一组带on的短语动词。come on“偶然遇到"(on是介词,也可用upon),属于干扰项,可排除;hang on和hold on有下列相同的意思(on是副词,不能用upon代替):(1)“紧紧抓住不放”。如:The climber had to hang on(hold on)while his com—panions went to find a rope. “攀登者不得不紧紧抓住,与此同时,他的伙伴去找绳子。”(2)(多用于接电话时)“等一下”。I’m afraid the line is busy,would you like tohang on(hold on)?“占线,请你等一下。”(3)(尽管有困难)“坚持下去”。Paintingthe house is tiring,but if you hang on(hold on),the results are worth the effort.“粉刷房屋是累人的活,但如果坚持下去,从结果看还是值得干的。”count on和hang on都有depend on的意思(这里的on是介词,可以用upon代替),但是count on作“指望,依赖”讲,一般由某人作主语,宾语可以是someone或something;hang on意思是“靠……决定……,取决于……”,多用物作主语,宾语只能用something。试比较下列句子:Don’t count on your relatives to help you out of trouble.“不要指望你的亲戚帮你摆脱困难。”I’d like to come with you but that’s not a promise,don’t count on it.“我愿意和你去,但这不是许诺,别抱希望。”这两句都不能用hang on。The casehangs upon the judge’s opinion of the prisoner’s character.“案子的处理取决于法官对罪犯品质的意见。”His whole career hangs on whether he can pass the exam.“他今后的发展取决于是否能通过考试。”这两句也不能换成count on。综上所述,按句意只能选择B。
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