题目内容
We are now in the age of great changes. Everything sometimes ________ before it is felt.
| A．change | B．had changed | C．has changed | D．changed |
C
解析试题分析：整个句子用的都是现在时，所以排除BD选项。主语是“everything”故排除A选项。用现在完成时强调结果。句意：我们现在处在伟大的变革时代。常常是等到一切变化了我们才感觉到。
考点：动词的时态
阅读快车系列答案Close the door of fear behind you，and you _________ the door offaith open before you．
| A．see | B．have seen | C．will see | D．are seeing |
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| A．started | B．has started | C．was starting | D．had started |
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| A．will arrive | B．arrives | C．is arriving | D．is going to arrive |
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| A．was decorated | B．had decorated |
| C．had been decorating | D．was being decorated |
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| A．had informed | B．have informed |
| C．had been informed | D．have been informed |
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| A．had feared | B．has feared | C．would fear | D．feared |
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－Because large quantities of water______．
| A．have been polluted | B．is being polluted |
| C．has been polluted | D．have polluted |
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| A．have helped | B．helped | C．help | D．helps |