7．While the supplies can meet our current demand，they can，             ，last a month．（　　）
A．at commandB．at lengthC．at randomD．at best

分析 雖然供應(yīng)能滿足我們目前的需求，但它們最多可以持續(xù)一個(gè)月．

解答 答案：D 
考查介詞短語(yǔ)：A．a(chǎn)t command 可以自由使用；B．a(chǎn)t length最后；C．a(chǎn)t random 任意地；D．a(chǎn)t best 至多．本句句意：雖然供應(yīng)能滿足我們目前的需求，但它們最多可以持續(xù)一個(gè)月．結(jié)合選項(xiàng)，將答案帶入句中，選D．

點(diǎn)評(píng) 考生平時(shí)應(yīng)注意積累相應(yīng)的單詞和短語(yǔ)的用法，解答該類題時(shí)，首先要對(duì)選項(xiàng)用法有深刻的了解．確定它們各自不同于另外三項(xiàng)的用法，再結(jié)合選項(xiàng)，將其帶入句中，一般語(yǔ)意邏輯通順，即為正確答案．

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