—Why didn’t Susan come to school?
—I don’t know. She____ ill.
A．could beB．may have beenC．mightD．must have been
B
本題回答語(yǔ)表示的含義是蘇珊可能生病了，所以導(dǎo)致的后果是她未能上學(xué)，故用情態(tài)動(dòng)詞may+完成時(shí)態(tài)的結(jié)構(gòu)，故本題選B。
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