问题
选择题
_____ the Internet brings much profit in, it can cause o lot of social problem.
A．If
B．While
C．Once
D．When
答案
答案：B
考查连词的辨析。依据句意来突破。从profit和problem发现前后对比转折，故选B
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_____ the Internet brings much profit in, it can cause o lot of social problem.
A．If
B．While
C．Once
D．When
答案：B
考查连词的辨析。依据句意来突破。从profit和problem发现前后对比转折，故选B