问题
选择题
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
答案：B
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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