We _______ work very quickly.

A．don’t needB．needn’t toC．need not toD．don’t need to

D

解析試題分析: 此題重點(diǎn)考查動(dòng)詞need的用法，它有兩個(gè)詞性，作為情態(tài)動(dòng)詞時(shí)經(jīng)常用在否定句中，并且后跟動(dòng)詞原形；作為實(shí)義動(dòng)詞時(shí)后可跟名詞，動(dòng)詞不定式，動(dòng)詞的現(xiàn)在分詞（表示被動(dòng)意義）,其否定形式要借助助動(dòng)詞do的形式.根據(jù)語(yǔ)境可知此句的含義是我們沒(méi)有必要干的那么快.根據(jù)語(yǔ)境和need的基本用法,可知D為正確答案.
考點(diǎn)：need的基本用法。
點(diǎn)評(píng)：此題的關(guān)鍵要看怎樣區(qū)分need的詞性.A和D中的need是行為動(dòng)詞,但作為行為動(dòng)詞need的基本用法是need to do sth,A的答案是不對(duì)的;B和C都是情態(tài)動(dòng)詞,而need作為情態(tài)動(dòng)詞其后只能跟動(dòng)詞原形,故其也是錯(cuò)誤的,故選D.因此區(qū)分need的詞性是解題的關(guān)鍵,但要分析題干的基本結(jié)構(gòu).

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1 

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A. Their chemistry teacher.

B. Their headmaster.

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