---How's your tour around the North Lake? Is it beautiful?---It ________ be, but it is now heavily polluted.A.willB.wouldC.shouldD.must
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C解析句意:--你的北湖之游怎么样?北湖很美吗?--应该是的,但是现在它被严重污染。will“会,将”;would表时态为过去将来时;用在交际用语中表客气语气;用在虚拟的语境下,should“应该,竟然”,must“一定,必须”。根据题意,此处为“应该”,故选C。