Question

_____ these experiments were successfully completed would we think of
going into humans.

A．If only

B．So that

C．Only if

D．Even if

Answer 1

C

試題分析：A.要是…多好 B.如此…以致于 C.只有在…時候 D.即使。句意：只有在這些實驗都被成功的完成的時候，我們才會去考慮研究人類。故選C
點評：本題首先同意理解在先，句意理解后，答案就知道了，其次值得注意的是本題中only置于句首時，句子部分倒裝。