He has made another wonderful discovery, _____ I think is of great importance to
题型：不详难度：来源：
He has made another wonderful discovery, _____ I think is of great importance to science. | A．which | B．what | C．when | D．that |
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答案
| A |
解析
| 考察定语从句。Which指代先行词discovery在句中作主语。What不是定语从句的关系词，when是关系副词，that不能引导非限制性定语从句。故A正确。 |
举一反三
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Eventually I reached the point _____ I was beginning to enjoy my work.| A．where | B．when | C．that | D．which |
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The reason ______ at the meeting for being late was not reasonable. | A．why he gave | B．what he gave | C．he gave | D．on which he gave |
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If there is anyone out there still doubts that America is a place where all things are possible，tonight is your answer. | A．where | B．who | C．which | D．whom |
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| _______ is reported in the newspaper, talks between the two countries are making progress. |
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