问题补充：
27．---Mary, you didn’t show up at the meeting last week?
---No, I, but my son had a sudden fever and I had to stay at home to take care of him.
A. didn’t
B. was going to
C. had to
D. wouldn’t
答案：
A. didn’t
(答案→)B. was going to
C. had to
D. wouldn’t
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