_______, the experiment will be successful. A．If carefully doingB．If it done car
题型：不详难度：来源：
_______, the experiment will be successful. | A．If carefully doing | B．If it done carefully | | C．If carefully done | D．If doing carefully |
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答案
| C |
解析
试题分析：考查省略。在if引导的条件状语从句中，省略了主语和be动词，experiment与do之间是被动关系要用被动语态，即完整句子应该是，If the experiment is done carefully。所以答案选C。 |
举一反三
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Whom do you think Mary will _________ into the matter instead of her? | A．have looked | B．have to look | C．have had looking | D．have look |
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Our English teacher often gets us _____ some famous films in the class.| A．watch | B．watching | C．to watch | D．watched |
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