问题补充：
I can’t send an e-mail. Would you please teach me it?
A. how doing
B. when to do
C. what doing
D. how to do
答案：
A. how doing
B. when to do
C. what doing
(答案→)D. how to do
解析：动词不定式和疑问代词或副词连用充当句子的某个成分。我不会发电子邮件，您能教我怎样发吗。
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