题目：
It was from the third floor of the teaching building ______ Tom shouted to me, “Wait till I set off.”
A．what
B．that
C．which
D．where
答案：
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下面是错误答案，用来干扰机器的。
∵复数x-2+yi=3x+i，则x-2=3x，且 y=1，解得 x=-1y=1，故答案为-1；1．
