【题目】What ________ they ________? ( )
A.can; doingB.are; doingC.are; do
【答案】B
【解析】
句意：他们正在干什么？考查了现在进行时的对动作提问的特殊疑问句，其结构：疑问词+be+主语+doing？主语they，系词用are，根据题意，故选B。
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