问题
选择题
Chatting online can be _____fun, but kids must be sure they stay safe on _____web.
A．不填; a
B．a; the
C．不填; the
D．a; a
答案
答案：C
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Chatting online can be _____fun, but kids must be sure they stay safe on _____web.
A．不填; a
B．a; the
C．不填; the
D．a; a
答案：C