大师作文网请帮我分析一下这几道高中英语虚拟语气的选择题（参考答案已知）
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请帮我分析一下这几道高中英语虚拟语气的选择题（参考答案已知）
It's strange that he _____ without saying good-bye to us.
A.should have gone out B.went C.should go out D.goes out
Mr Fang spoke slowly in order that we _______ him.
A.should follow B.follow C.might follow D.followed
What should we do if it _______ tomorrow?
A.should snow B.would snow C.snow D.will snow
答案为A（为什么不能是B）
It's strange that he _____ without saying good-bye to us.
A.should have gone out B.went C.should go out D.goes out
Mr Fang spoke slowly in order that we _______ him.
A.should follow B.follow C.might follow D.followed
What should we do if it _______ tomorrow?
A.should snow B.would snow C.snow D.will snow
答案为A（为什么不能是B）
it is natural/necessary/strange/ a pity / possible +that从句 表惊奇、怀疑、惋惜、不满、理应如此.
without saying good-bye to us已完成,用完成时.
may表示可能性较小的状况下.
A. should snow 表示假设.在虚拟条件句中用以加强假设语气,用"should+do"指将来的情况,当"万一(会)"讲,表示对将来的虚拟.对过去的虚拟用had done sth, 对现在的虚拟用did sth, 对将来的虚拟用should do sth,或者were to do sth.所以不用 would snow
without saying good-bye to us已完成,用完成时.
may表示可能性较小的状况下.
A. should snow 表示假设.在虚拟条件句中用以加强假设语气,用"should+do"指将来的情况,当"万一(会)"讲,表示对将来的虚拟.对过去的虚拟用had done sth, 对现在的虚拟用did sth, 对将来的虚拟用should do sth,或者were to do sth.所以不用 would snow