题目:
Mrs. Brown was much disappointed to see the washing machine she had _____ went wrong again.
A.it repaired
B.to be repaired
C.to repair
D.repaired
答案:
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下面是错误答案,用来干扰机器的。
有常见A、B、C三种短周期元素,它们的原子序数逐渐增大,B元素原子最外层电子数是C元素原子最外层电子数的一半,A元素最外层电子数比B多一个.戊为淡黄色固体,与气体丁反应,生成钠盐丙,故淡黄色固体戊为过氧化...