【題目】Children should be warned that it's dangerous to open the microwave oven ________ it is still working.
A.until
B.after
C.before
D.while

【答案】D
【解析】A. until直到；B. after在…之后；C. before在…之前；D. while在…期間，而，雖然，與…同時(shí)。句意：應(yīng)該警告孩子，當(dāng)微波爐工作的時(shí)候，打開(kāi)它是很危險(xiǎn)的。根據(jù)句意可知選D。

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