He asked them to come to his office one _____.
A.a(chǎn)t a timeB.a(chǎn)t all timeC.a(chǎn)t timesD.a(chǎn)t one time
A

試題分析:考查詞組:A. at a time一次B. at all time一直C. at times有時D. at one time曾經(jīng),句意:他叫他們一次一個去他的辦公室。選A。
點(diǎn)評:解答這類題目,首先要理解題干的意思,其次要知道各選項(xiàng)詞組的意思,然后像數(shù)學(xué)中的代入法一樣,依次把各個選項(xiàng)意思放入句子中進(jìn)行比較,不難選出正確答案。關(guān)鍵還是在平時學(xué)習(xí)的過程中,多積累多總結(jié)多記憶。以動詞或者名詞作為中心詞進(jìn)行記憶,是個不錯的方法。
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