问题补充：
I really don’t know .
A. how can I do
B. what I should do
Cwhat should I do
D. how should I do
答案：
A. how can I do
(答案→)B. what I should do
C. what should I do
D. how should I do
解析：句意：我真不知道我应该做什么？分析题意：宾语从句中从句用陈述语序，做的内容用what引导。其它三项语序不对。故选B
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