题目内容
7.Exactly ____ the potato was introduced into Europe is uncertain,but it was probably around 1565.( )A. | whether | B. | why | C. | when | D. | how |
分析 句意:准确的说,土豆是什么时候被传到欧洲的还不确定,但是可能在1565年左右.
解答 答案C.分析句子结构可知,but前后是两个句子,第一个句子中"is uncertain"是句子的谓语,"Exactly ____ the potato was introduced into Europe"是的主语,因此这里是主语从句.根据句子的意思"准确的说,土豆是什么时候被传到欧洲的还不确定"可知,需要用连接词"when"来引导主语从句.其它选项均不符合,故选C.
点评 本题考查主语从句.解答此类题目首先要读懂句意和分析句子结构,判断是哪一种从句,然后分析从句中的成分,如果从句中不缺主宾表等成分,则应根据句意来锁定连接词.
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