问题
选择题
.
They ___ out because the light’s on. Let’s go upstairs and have a look.
A．mustn’t go
B．can’t have gone
C．couldn’t go
D．might have gone
答案
答案：B
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.
They ___ out because the light’s on. Let’s go upstairs and have a look.
A．mustn’t go
B．can’t have gone
C．couldn’t go
D．might have gone
答案：B