As we all know the H1N1 Flu is so serious, students can’t go into the school _______ they take the temperature and get sure they don’t have a fever.
A.tillB.a(chǎn)fterC.whenD.until
D

試題分析:句意:眾所周知H1N1流感是如此的嚴重,學生們只有量好體溫并且確定不
發(fā)燒才能去上學。A. till 直到用于肯定句中,主句謂語動詞一般是持續(xù)性的 B. after 在…… 之后C. when 當……的時候  D. until 直到not….unit 直到……才。
根據(jù)句意故選D.
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