1. The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.

A. to be based on B. to base on

C. which to base on D. on which to base

2. _____evidence that language acquiring ability must be stimulated.

A. If being B. It is C. There is D. There being

3. We hadn’t met for 20 years, but I recognized her_____ I saw her.

A. the moment B. for the moment

C. the moment when D. at the moment when

參考答案及解析：

1. D。on which to base his arguments in favor of the new theory = The professor will base his arguments in favor of the new theory on sufficient grounds. 故答案為D。

2. C。句中有連詞that和謂語must be stimulated，缺少一個謂語動詞，排除A、D，該句譯成漢語是“有……的證據(jù)”，而不是“它是……的證據(jù)”所以排除B。故答案為C。

3. A。定冠詞the加上表示時間的名詞起連詞作用，引導(dǎo)時間狀語從句。如the night/ the minute/ the spring/ the year等。故答案為A。