It's nearly seven o'clock . Jack _____ be here at any moment .
A．mustB．needC．shouldD．can
C
根據(jù)語境空白處應(yīng)填表示具有"隨時(shí)可能"意義的情態(tài)動(dòng)詞。雖然can可以表示可能性，但它往往表示的是對這種可能性的懷疑。例如：Can he still be alive after all these years ? (這么多年之后，他還可能活在人世嗎？) should除具有"應(yīng)該"詞義之外，還有一個(gè)含義是：will probably (將來很可能發(fā)生)又如：His uncle is working among the enemy officials now . Dangerous things should happen to him at any time . (他的叔叔現(xiàn)在在敵人的軍營中工作，危險(xiǎn)的事隨時(shí)都可能發(fā)生在他身上。)
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