问题
选择题
—Is everyone here today?
—No, Tom isn't here. He must ___________. [ ]
A. is ill
B. be ill
C. be illness
D. healthy
答案
答案：B
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—Is everyone here today?
—No, Tom isn't here. He must ___________. [ ]
A. is ill
B. be ill
C. be illness
D. healthy
答案：B