________ these experiments were successfully completed would we think of going into humans.
A．If onlyB．Only ifC．So that D．Even if
B

試題分析：句意：只有這些實(shí)驗(yàn)完全成功以后，我們才會(huì)考慮把它應(yīng)用于人類。根據(jù)“would we think of going into humans.”可知這個(gè)句子使用了部分倒裝，所以用only+狀語從句位于句首，選B。
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