Many scientists have that we will face more serious environmental problems if we can’t come up with solutions to deal with pollution.A. looked out B. called out C. pointed out C [解析]句意:许多科学家指出如果我们题目和参考答案——青夏教育精英家教网—

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Many scientists have ________ that we will face more serious environmental problems if we can’t come up with solutions to deal with pollution.

A. looked out B. called out C. pointed out

C 【解析】句意：许多科学家指出如果我们不能提出解决方案处理污染，我们将会面对更加严重的环境问题。looked out小心，当心；called out 唤起，出动；pointed out指出。根据句意可知，这件事是由科学家们指出来的，故应选C。

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B 【解析】句意：他不得不放弃这个计划，好吗？这里是反义疑问句，陈述部分有have to +v. (had to + v.)，疑问部分常用don't +主语（didn't +主语）。如：We have to get there at eight tomorrow, don't we?因为前面是had to，所以后半部分用didn't，故选B。

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