She（）mail the package before the post office closes.
A: has
B: have to
C: has to
D: must to
出自：国家开放大学《商务英语(本科)》
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She（）mail the package before the post office closes.
A: has
B: have to
C: has to
D: must to
出自：国家开放大学《商务英语(本科)》