it must ＿ interesting to clim up the huangmountain. a.is b.are c.be
问题描述：
it must ＿ interesting to clim up the huangmountain. a.is b.are c.be
答
C
情态动词要用要动词原形，所以be
爬黄山一定很有意思
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答
C
MUST 情态动词后接动词原形