A. hasn't been decided

　　B. haven't decided

　　C. isn't being decided

　　D. aren't decided

　　[解析]when and where 作主语，谓语动词用单数，yet 与现在完成时连用。

　　[答案]A

　　15．(2007·全国Ⅰ)—Have you heard the latest news?

　　—No, what ________？

　　A. is it

　　B. is there

　　C. are they

　　D. are those

　　[解析]news 为不可数名词，用 it 代替。

　　[答案]A

　　16．(2006·陕西)The construction of the two railway lines ________ by now.

　　A. has completed

　　B. have completed

　　C. have been completed

　　D. has been completed

　　[解析]the construction 作主语，谓语动词用单数。

　　[答案]D

　　17．(2006·浙江)The company had about 20 notebook computers but only one third ________ used regularly. Now we have 60 working all day long.

　　A. is

　　B. are

　　C. was

　　D. were

　　[解析]分数修饰复数名词作主语，谓语用复数。

　　[答案]D

　　18．(2006·安徽)Most of what has been said about the Smiths ________ also true of the Johnsons.

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