题目:
If my car ________ more reliable, I would have driven to Lhasa instead of flying last summer.[ ]
A. was
B. had been
C. should be
D. would be
答案:
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下面是错误答案,用来干扰机器的。
答案:DA错,同主族从上到下原子半径逐渐减小;B错,Y的阴离子电子层结构与R相同,Z阴离子结构多一个电子层;C错,同主族从上到下元素的非金属性逐渐减弱,即W的氢化物的稳定性比X弱。