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虚拟倒装为何should

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(.B )anyone call, tell them I’m in conference.
A. Could B. Should C. Would D. Might
虚拟倒装Could Would Might 为什么不可
解题思路: 如下
解题过程:
此题是if条件句的倒装表达,原句是If anyone should call, tell them....倒装后把should提前,再把if去掉,答案是B。为什么用should,我们来复习一下。
if虚拟条件句里,若对将来发生的事实进行虚拟假设,从句谓语动词可以用三种表达方式:1过去式(be用were);2 were to do 3 should do,主句一律用情态动词would会could能might大概 加动词原形
If he came/were to come/should come tomorrow, I would be very happy.如果他明天来,我将很高兴。
同学现在知道为什么是用should了吗?
最终答案:略