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2道倒装句选择题疑问1.They would certainly have come and helped us ___

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2道倒装句选择题疑问
1.They would certainly have come and helped us ___ time.
A had they had
B did they have
C had they have
D would they have
2.Nowhere else along the coast ____ such shallow water so far from land.
A is there
B there is
C it is
D is it
请告诉我答案以及原因
1.A
虚拟语气的用法之一:与过去事实相反的,主句用would have done,从句用过去完成时.这个句子中,前面的是主句,后面的从句倒装,还原过来应该是if they had had time
2.A
因为表否定的副词Nowhere放在句首,所以主句要倒装,明显是一个there be句型,所以选A