问题
选择题
— Everyone in my class passed the exam.
— Oh, really? It _____ difficult.
A. can't have been
B. needn't have been
C. must be
D. mightn't be
答案
答案：A
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— Everyone in my class passed the exam.
— Oh, really? It _____ difficult.
A. can't have been
B. needn't have been
C. must be
D. mightn't be
答案：A