题目内容
6．If you _______ the book，you _______ buy it right now，I think．（ ）| A． | needn't； needn't | B． | don't need； don't need | ||
| C． | don't need； needn't | D． | don't need； needn't to |
分析 如果你现在不需要这本书，那么我觉得你现在不必买它．
解答 正确答案：C．
need是一个半情态动词，作情态动词是必须，不得不，作实义动词是需要，后可跟动词不定式．根据句意如果你现在不需要这本书，那么我觉得你现在不必买它，可知第一空表示"不需要"，need是实义动词作谓语，应填写其否定式don't need．第二空表示"不必"，且后有动词buy，need是情态动词，应填写其否定式needn't，故选择C．right now表示现在、立刻．
点评 本题考查need，解题的关键是判断出need是情态动词还是实义动词，然后根据句意进行选择．
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