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
网友回答
A. how can he send
B. how does he send
(答案→)C. how to send
D. how sending
解析：本题know后跟的是从句，应该用正常顺序，故不选AB，在英文中，可用疑问词+动词不定式to do代替从句，故本题选C。