问题
选择题
-Carl, if you have nothing to do, you ________ as well tidy up your room.
-OK.[ ]
A．can
B．should
C．must
D．may
答案
答案：D
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-Carl, if you have nothing to do, you ________ as well tidy up your room.
-OK.[ ]
A．can
B．should
C．must
D．may
答案：D