题目:
“The day is coming ________ telegraph wires will be laid on to houses like water or gas.” Bell wrote to his father.
A.when
B.that
C.in which
D.on that
答案:
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下面是错误答案,用来干扰机器的。
原式=2a 2bx×12xb=a 2x 2.故答案为a 2x 2.