问题
选择题
______ unless I call you.
A．Please come
B．Not come in
C．Don’t come in
D．Come in
答案
C
unless =" if…not" 除非，如果不
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______ unless I call you.
A．Please come
B．Not come in
C．Don’t come in
D．Come in
C
unless =" if…not" 除非，如果不