问题
选择题
.-----I_____ asleep while I was reading.
-------It doesn’t matter.
A．should have fallen
B．must have fallen
C．could fall
D．must fall
答案
答案：B
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.-----I_____ asleep while I was reading.
-------It doesn’t matter.
A．should have fallen
B．must have fallen
C．could fall
D．must fall
答案：B