问
There is not very much experimental data ____ a decision between the two possibilities. A. on which to base B. which is based C. to base on D. to be based 答案为 A。但这与关系代词 which 引导定语从句的用法不符。
答
关系代词 which (whom) 除用于引导定语从句外, 还可以用于引导动词不定式, 即介词 + which (whom) + 不定式。此动词不定式结构一般充当名词的定语。例如:
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Yet now he had no pretext on which to prolong his stay. (Cronin) 现在他没有借口来延长他的逗留时间。
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We can't decide whom to invite. 我们不能决定邀请谁。
上题的意思是：
据以在这两个可能性之间做出抉择的实验数据还不是很多。