题目内容
________ these experiments were successfully completed would we think of going into humans.
| A．If only | B．Only if | C．So that | D．Even if |
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。
考点：考查部分倒装
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