问题
选择题
Mike said he was thinking about _____ the maths problem at that time.[ ]
A. which to do
B. what to do
C. how to do
D. why to do
答案
答案：C
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Mike said he was thinking about _____ the maths problem at that time.[ ]
A. which to do
B. what to do
C. how to do
D. why to do
答案：C