题目内容
（请给出正确答案）
[主观题]
The problem Howe was trying to solve was______.A．what kind of thread to useB．how to design
The problem Howe was trying to solve was______.
A．what kind of thread to use
B．how to design a needle which would not break
C．where to put the needle
D．how to get the thread to run smoothly around the needle
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