3．There are so many kinds of reference books on sale that I can't make up my mind which ________．（　�。�
A．to be boughtB．to buyC．buyingD．bought

分析 句意：有如此多種的參考書在銷售，以至于我不能決定該買哪一本．

解答 答案：B．
本題中，應該是用"which+不定式"的結(jié)構(gòu)來在句中做賓語，故排除C、D；在"疑問詞+動詞不定式"的省略結(jié)構(gòu)中，動詞（buy）的邏輯主語應該就是主句的主語I，它們之間構(gòu)成主動關(guān)系，故應用主動形式"to buy"，選B．

點評 本題考查疑問詞+動詞不定式的用法． 
1．"疑問詞+動詞不定式"結(jié)構(gòu)中的疑問詞，包括疑問代詞what which who和疑問副詞when how where 等．這些疑問詞和不定式一起構(gòu)成了不定式短語，這種結(jié)構(gòu)在句子中除了不能作謂語外，可做主語、賓語、表語等．
2．這種結(jié)構(gòu)相當于一個名詞性從句，不論它在句子中做什么成分，常常都可用同等成分的從句替代．改為從句時只要在疑問詞后面填加一個適當?shù)闹髡Z并將不定式動詞改為適當形式的謂語既可．
3．當這種結(jié)構(gòu)做賓語的時候，常常置于show，find out，learn，teach，tell，advise，wonder，know，discuss，remember，forget，explain 等動詞之后．

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