導讀題目:Whenandwheretobuildthenewfactory______yet.A：isnotdecided(正確)B：arenotdecided....

題目:

When and where to build the new factory ______ yet.

A： is not decided (正確)

B： are not decided

C： has not decided (誤選)

D： have not decided

題中有yet為什么不用完成時?

答：選A

解析：“疑問詞 to do sth.”作主語，謂語動詞用單數形式，與不定式短語作主語，謂語動詞也用單數形式相同。由此可以排除B, D; decide 與 when and where to …存在著邏輯上的動賓關系，表被動，故應使用被動語態，因此該題正確答案為A. 如果C項為has not been decided, 則也正確。