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问题: 英语虚拟语气

1. She insisted that a doctor _____ immediately
A. had sent for B. send C. be sent for D. was sent
2.The kind-hearted couple treat the orphan very well as though he ____ their own son.
A. is B. were C. had been D. should be
请详细解答,谢谢

解答:

1. C。主句中insist“坚持”要求其所跟的从句使用should(可省略)+动词原形的结构,而医生不是自己找,是让人找,所以应该用被动式,B不符合。
2。B。对现在情况或对一般真理的虚拟时,使用一般过去式,在谓语为“to be”的现在虚拟中,无论单数还是复数都应该变为were。补充一下,在当代英语口语中,也有使用was的情况,但一般被认为非规范英语.