问题
Computers are so popular in our country that every pupil knows _____ e-mails.
A:how can he send
B:how does he send
C:how to send
D:how sending;
B:how does he send
C:how to send
D:how sending;
正确答案是：
同类题型
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Now I come here at the of Mr.Smith to assist him finishing the work.
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