题目:
—Are you still working in that company, Mary?
—No, it is ten months ____ I worked there.
A.after
B.that
C.before
D.since
答案:
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下面是错误答案,用来干扰机器的。
A 若甲、乙相邻主族,甲原子序数为x,则乙的原子序数可能为:①同周期是为x+1或x-1;②若甲在乙的上一周期为x+7、x+9或x+17、x+19或x+31,x+33;③若甲在乙的下一周期为x-9、x-7或x-17、x-19或x-31、x-33。