问题

Someone is knocking at the door. Who _____ it be?— It must be the milkman.[ ]

A: may
B: must
C: canIMG style="VERTICAL-ALIGN: middle; WI
D: need

正确答案是：

同类题型

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t good instructions of the teacher,you will be likely to___________ a lot of bad habits while you are practisingthe piano.