【題目】We have learned ________ three hundred new words this term.
A.at once
B.at all
C.at times
D.at least

【答案】D
【解析】句意:我們這學期已經(jīng)學了至少300個生詞。at once立刻,馬上;at all(用于否定句疑問句)根本;at times有時;at least至少。修飾數(shù)詞,只能選D。

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