问题补充：
She looks very busy . I want to help her , but I don know .
A. what to do
B. what to do it
C. how to do
D. why to do
答案：
(答案→)A. what to do
B. what to do it
C. how to do
D. why to do
解析：她看上去很忙，我想帮助她，但是我不知道该做什么。根据题干的含义可知选择A. what to do
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