Must I wait here all morning？I have a lot of work to do．
No，you____．You may be back in the afternoon．（ ）
A．mustn'tB．can't
C．don't have to
Must I wait here all morning？I have a lot of work to do．
No，you____．You may be back in the afternoon．（ ）
A．mustn'tB．can't
C．don't have to
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