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298] Though ______, many laws of nature exist.

[譯文] 盡管沒有被發現，但是許多自然規律是存在的。

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

　 C. not having discovered 　 D. having not discovered

[答案及簡析] A。 連詞加現在分詞短語作狀語；此句等于：Though the laws of nature have not been discovered

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

[譯文] 這個仆人盡了她的努力來幫助革命者。

　 A. what, help 　 B. that, to help

　 C. what, to help 　 D. all help

[答案及簡析] 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.

[譯文] 最后一次看到那個丟失的孩子時他在河邊玩。

　 A. playing 　 B. to be playing

　 C. play 　 D. to play

[答案及簡析] A。 現在分詞作主語補足語，表示進行。

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

[譯文] 他給我電話號碼以便我們需要他幫助的時候好聯系。

　 A. to 　 B. of me to

　 C. for me to 　 D. that I

[答案及簡析] C。 固定結構。in order (for sb.) to do sth.

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

[譯文] 工廠離他的家大約五公里左右。

　 A. so far 　 B. or so

　 C. far 　 D. way

[答案及簡析] B。 or so"左右"

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

[譯文] 小男孩找到了你藏在床下的玩具。

　 A. hide 　 B. hiding

　 C. to hide 　 D. hid

[答案及簡析] D。 定語從句中差賓語。

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

[譯文] 明天要舉行的會議是關于制止污染的問題。

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

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

[答案及簡析] B。 不定式作定語表示將來和目的；介詞后面跟動名詞作賓語。

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

[譯文] 如果你吃了這藥，你現在會覺得好一些的。

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

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

[答案及簡析] C。 這是典型錯綜復雜條件狀語從句中的虛擬語氣問題。從句和主句的時態各自按各自的情況判斷時態。

289] Children in China today have nothing ______.

[譯文] 中國的小孩沒有什么可擔憂的。

　 A. to worry 　 B. worried

　 C. to worry about 　 D. worrying about

[答案及簡析] C。 在sb. have sth. to do句型中不定時作定語一是主動的，二必須是及物的。