问题
选择题
30.________some English-learning websites if you are free, and you will learn a lot about how to study English.
A．Having visited
B．To visit
C．Visiting
D．Visit
答案
答案：D
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30.________some English-learning websites if you are free, and you will learn a lot about how to study English.
A．Having visited
B．To visit
C．Visiting
D．Visit
答案：D