【题目】Tom and Mary ________ the park in Beijing. ( )
A.is visitingB.are visitingC.do visiting
【答案】B
【解析】
句意为汤姆和玛丽正在参观北京。现在进行时结构：助动词 be ( am / is / are ) +现在分词，Tom and Mary两个人后面系动词用are。参观visit现在分词为visiting。故答案为B。
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