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這不是考查強(qiáng)調(diào)句嗎　　

請(qǐng)看下面一題，它是考查強(qiáng)調(diào)句式嗎？　　

It might have been John __________ bought a new book for Mary yesterday. 　　

A. what                        B. since                        C. that                        D. then 　　

此題應(yīng)選 C。此題的難點(diǎn)在于考生看不出這是一個(gè)強(qiáng)調(diào)句型，因?yàn)橹骶涞闹^語(yǔ)動(dòng)詞be采用了might have been這一復(fù)雜形式。此句若改為非強(qiáng)調(diào)句，則可以是：　　

John might have bought a new book for Mary yesterday. 約翰昨天可能給瑪麗買了一本新書。　　

將此句改為強(qiáng)調(diào)句(強(qiáng)調(diào)主語(yǔ))，則可以有兩種形式：　　

a. It is John that might have bought a new book for Mary yesterday. 　　

b. It might have been John that bought a new book for Mary yesterday. 　　

又如：　　

It must be a girl that wrote the letter. 寫這封信的一定是個(gè)女孩。　　

It might be yesterday that he left for Beijing. 他可能是昨天去北京的。　　

Can it be Jim that has stolen the money? 偷錢的會(huì)是吉姆嗎?　　

It may be next week that he leaves for Paris. 他可能是下個(gè)星期去巴黎。　　

It might have been her boyfriend that bought so nice a handbag for her. 給她買那樣好看一個(gè)手提包的可能是她的男朋友。