______ the teacher has given permission, ______allowed to use the equipment in t
题型：不详难度：来源：
______ the teacher has given permission, ______allowed to use the equipment in the lab.| A．Only if, are the students | B．If only, the students are | | C．If only, are the students | D．Only if the students are |
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答案
| A |
解析
试题分析：句意：只要老师答应，学生被允许使用实验室的设备。这里是only修饰if的从句放在句首时，句子的主句用部分倒装，故选A。 |
举一反三
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| A．fell the boy | B．fell he | | C．did he fall | D．did the boy fell |
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Not until his father died _______ what his father really meant. | A．do they realize | B．did they realize | | C．realized they | D．had they realized |
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Only after the woman had her own child ________ how difficult it was to be a mother.| A．she realized | B．had she realized | | C．she had realized | D．did she realize |
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