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&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(gè)謂語動(dòng)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(shí)間的名詞起連詞作用，引導(dǎo)時(shí)間狀語從句。如the night/ the minute/ the spring/ the year等。故答案為A。