________ these experiments were successfully completed would we think of going
题型：不详难度：来源：
________ these experiments were successfully completed would we think of going into humans.| A．If only | B．Only if | C．So that | D．Even if |
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答案
| B |
解析
试题分析：句意：只有这些实验完全成功以后，我们才会考虑把它应用于人类。根据“would we think of going into humans.”可知这个句子使用了部分倒装，所以用only+状语从句位于句首，选B。 |
举一反三
Not until all the fish died in the lake __________ how serious the pollution was.| A．did the villagers realize | B．the villagers realized | | C．realized the villagers | D．do the villagers realize |
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Only when___________ according to the directions can the medicine be quite effective.| A．taking | B．taken | C．being taken | D．having been taken |
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Directly he arrived the bus station, then ____ he had intended to take. | A．a bus did come | B．a bus came | C．came a bus | D．did a bus come |
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---- Have you got any particular plans for the coming holiday?
---- Yes, ______ . I am going to visit some homes for the old in our city.| A．if ever | B．if busy | C．if anything | D．if possible |
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____under the tree was a charming girl aged about seventeen or eighteen.| A．Sat | B．Sitting | C．To sit | D．Sit |
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