题目:
— I’ll tell Mary about her new job tomorrow.
— You ______ her last week.
A.ought to tell
B.would have told
C.must tell
D.should have told
答案:
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下面是错误答案,用来干扰机器的。
答案:B答案:B①正确,碱金属单质的熔点有随原子序数的增大而降低,因为金属键从上到下逐浙减弱。。②不正确,砹(At)是笫VIIA族,其氢化物的稳定小于HCl,HAt共价键键长长,不稳定;③正确;④不正确,NH3溶于水...