13.        these experiments were successfully completed would we think of going into humans.( 。
A.If onlyB.If everC.Only ifD.Even if

分析 只有這些實(shí)驗(yàn)成功完成我們才會(huì)考慮在人類(lèi)身上(進(jìn)行試驗(yàn)).

解答 答案:C
解析:A如果;B很少;難得;C只有…才;D即使;甚至.根據(jù)后面的"我們才會(huì)考慮在人類(lèi)身上(進(jìn)行試驗(yàn))"可知前面說(shuō)的是"只有這些實(shí)驗(yàn)成功完成",作為后面的一個(gè)前提條件.故本題答案為C選項(xiàng),其余選項(xiàng)均不符合題意.拓展:only if位于句首時(shí)其后的主句要用部分倒裝,而本題其余選項(xiàng)后面的主句均不需倒裝.

點(diǎn)評(píng) 本題考查連詞辨析.做此類(lèi)題目時(shí)一定要熟悉每個(gè)連詞的含義并結(jié)合用法與其在句中的成分來(lái)選擇合適的答案.

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