问题补充：
--- Hello, is Mary in?
--- Im sorry she come to the phone because she is having a bath.
A. won
B. mustn
C. can
D. wouldn
答案：
A. won
B. mustn
C. can
D. wouldn
解析：查情态动词。答语意为“她正在洗澡，不能来接电话。”
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