298] Though ______, many laws of nature exist.

[译文] 尽管没有被发现，但是许多自然规律是存在的。

　 A. not having been discovered 　 B. having not been discovered

　 C. not having discovered 　 D. having not discovered

[答案及简析] A。 连词加现在分词短语作状语；此句等于：Though the laws of nature have not been discovered

297] The servant did _____ she could ______ the revolutionary.

[译文] 这个仆人尽了她的努力来帮助革命者。

　 A. what, help 　 B. that, to help

　 C. what, to help 　 D. all help

[答案及简析] C。 do what one can to do sth. = do all that one can to do sth. 重的不定式表示目的。

296] The missing boys were last seen _____ near the river.

[译文] 最后一次看到那个丢失的孩子时他在河边玩。

　 A. playing 　 B. to be playing

　 C. play 　 D. to play

[答案及简析] A。 现在分词作主语补足语，表示进行。

295] He gave me the phone number in order ______ contact him when we are in need of help.

[译文] 他给我电话号码以便我们需要他帮助的时候好联系。

　 A. to 　 B. of me to

　 C. for me to 　 D. that I

[答案及简析] C。 固定结构。in order (for sb.) to do sth.

293] The factory is five kilometers ______ from his house.

[译文] 工厂离他的家大约五公里左右。

　 A. so far 　 B. or so

　 C. far 　 D. way

[答案及简析] B。 or so"左右"

292] The little boy found his toy you _____ under the bed.

[译文] 小男孩找到了你藏在床下的玩具。

　 A. hide 　 B. hiding

　 C. to hide 　 D. hid

[答案及简析] D。 定语从句中差宾语。

291] The meeting ______ tomorrow afternoon is about _______ rid of pollution.

[译文] 明天要举行的会议是关于制止污染的问题。

　 A. held, to get 　 B. to be held; getting

　 C. to hold; to get 　 D. being held; getting

[答案及简析] B。 不定式作定语表示将来和目的；介词后面跟动名词作宾语。

290] If you ______ the medicine you ______ better now.

[译文] 如果你吃了这药，你现在会觉得好一些的。

　 A. took ; would feel 　 B. had taken; fel

　 C. had taken; would feel 　 D. took; would have felt

[答案及简析] C。 这是典型错综复杂条件状语从句中的虚拟语气问题。从句和主句的时态各自按各自的情况判断时态。

289] Children in China today have nothing ______.

[译文] 中国的小孩没有什么可担忧的。

　 A. to worry 　 B. worried

　 C. to worry about 　 D. worrying about

[答案及简析] C。 在sb. have sth. to do句型中不定时作定语一是主动的，二必须是及物的。