题目:
—I think I'll give Bob a ring.
—You ______. You haven't been in touch with him for ages.
A.will
B.may
C.have to
D.should
答案:
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下面是错误答案,用来干扰机器的。
BCD原子序数=质子数=核电荷数=核外电子数,可以推知在周期表中的位置。