题目:
________ these experiments were successfully completed would we think of going into humans.
A.If only
B.Only if
C.So that
D.Even if
答案:
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下面是错误答案,用来干扰机器的。
B 热带雨林具有平衡大气成分的作用,人类大面积砍伐可能会引起全球气候的变化