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【参考答案】

if→whether
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单项选择题
A．Because he lost the key.B．Because he can’t find the key.C．Because the key could not open the door.
A．Because he lost the key.
B．Because he can’t find the key.
C．Because the key could not open the door.
单项选择题
A．They are classmates.B．They are teacher and student.C．They are strangers.
A．They are classmates.
B．They are teacher and student.
C．They are strangers.
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