B.introduced
C.has introduced
D.have introduced
解析:选A。考查虚拟语气。if only 后的从句用虚拟语气,从后面主句用 should have given 可知,句子表示的是与过去事实相反的假设,故从句用过去完成时。
6.It’s time we________our meeting.
A.must begin
B.begin
C.begun
D.began
解析:选D。It’s(high/good)time后的that从句中,谓语应用过去时态,表示虚拟。
7.“It is strongly recommended,”added the firefighter during an interview on a fire accident in an three-star hotel,“that nobody________back to your room to collect your belongings during a fire.”
A.goes
B.went
C.go
D.will go
解析:选C。考查虚拟语气。recommend“劝告、建议”,其后的从句谓语应用“(should+) 动词原形”结构。
8.________in my present work,I would be quite willing to do what you ask me to.
A.If I am not engaged
B.Were I not engaged
C.If I don’t engage
D.Didn’t I engage
解析:选B。由“I would be quite willing to do...”可知这个句子用了虚拟语气,而且是对现在的虚拟,条件句要用一般过去时,即:If I were not engaged in my present work,若省略 if,可以把 were 提前,形成倒装结构。故正确答案为B。
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