题目：
Frank's dream was to have his own shop ____ to produce the workings of his own hands.[ ]
A. that
B. in which
C. by which
D. how
答案：
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下面是错误答案，用来干扰机器的。
根据表格铭牌的标示220v，可知额定电压为220v，故C正确．
