问题补充:
I lost my friend’s bike, and I really don’t know .
A. what should I do
B. what to do
C. how shall I do
D. how to do
答案:
A. what should I do
(答案→)B. what to do
C. how shall I do
D. how to do
解析:I really don’t know后如果跟宾语从句,从句要用陈述语序,所以排除A,C;句中不定式to do后缺do的宾语,所以选B。
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