17.----Dad,can we walk____the road now?
----No,we____.We have to wait until the light turns green.(  )
A.across;needn'tB.across;mustn'tC.through;can'tD.through;mustn't

分析 -爸爸,現(xiàn)在我們可以過馬路嗎?
-不,絕對不能,我們必須等到綠燈亮了再走.

解答 答案:B
across,through皆為介詞,都有"穿過"之意,但across指從物體上面穿過,而through指從物體中間穿過,此處"過馬路"要從上面穿過應(yīng)用across,排除選項C、D;needn't不必;mustn't禁止;can't不能;根據(jù)交通常識可知綠燈不亮是禁止過馬路的,故選B.

點評 本題考查介詞辨析和情態(tài)動詞辨析,先弄清它們的含義及用法,再根據(jù)情景選擇正確答案.

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