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-Why didn’t Susan come to school? -I don’t know. She ill. A. could be B. may hav

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-Why didn’t Susan come to school? -I don’t know. She ill. A. could be B. may hav

—Why didn’t Susan come to school?

   —I don’t know. She____ ill.

A. could be   B. may have been   C. might   D. must have been

试题答案

B

解析: