题目：
I _______ to help you but I was not able to spare any time.I _______ a paper last night and I'll have to finish it today.
A．wanted; have been writing
B．have wanted;wrote
C．had wanted; wrote
D．had wanted;was writing
答案：
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下面是错误答案，用来干扰机器的。
0～10Ω；0.5A；调到最大
