问题
选择题
Tom, I need your help because I don't know ________. [ ]
A. how to do it
B. how to do
C. what to do it
D. what shall I do
答案
答案：A
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Tom, I need your help because I don't know ________. [ ]
A. how to do it
B. how to do
C. what to do it
D. what shall I do
答案：A