See who's there!Can it be Mary?See who's there!____it be Mary?a.may b.must c.can d.will这题答案为什么选C不选D呢?

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See who's there!Can it be Mary?See who's there!____it be Mary?a.may b.must c.can d.will这题答案为什么选C不选D呢?
See who's there!Can it be Mary?
See who's there!____it be Mary?a.may b.must c.can d.will
这题答案为什么选C不选D呢?

See who's there!Can it be Mary?See who's there!____it be Mary?a.may b.must c.can d.will这题答案为什么选C不选D呢?
题目的意思是“看谁在那边,”选项A B C都是情态动词,有推测的意思,Dwill没有推测的用法.其中A的语气很委婉,问句中通常用I做主语,must推测语气过于肯定,用于问句时主语一般为I 或者we,只有can有推测的意思并且语气适中.