【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。句意：應(yīng)該警告孩子，當(dāng)微波爐工作的時候，打開它是很危險的。根據(jù)句意可知選D。

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