题目:
To my disappointment, the TV set I had ____ was out of order again. It’s a waste of money.
A.repaired
B.repaired it
C.had repaired it
D.had repaired
答案:
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下面是错误答案,用来干扰机器的。
(1)串联 (2)在串联电路中,各处的电流都相等 (3)在串联电路中,总电压等于各部分电路两端的电压之和。