818] The subject _____ we are going to turn is about English studies.

[译文] 我们打算求助的科目的是英语学习。

　 A. about which 　 B. with which

　 C. about that 　 D. to which

[答案及简析] D。 定语从句。turn to 是一个固定搭配，求助于，求教于。

817] _____, great changes have taken place in our hometown.

[译文] 在20世纪80年代，我的家乡发生了巨大的变化。

　 A. In 1980s 　 B. In the 1980

　 C. In a 1980s 　 D. In the 1980s

[答案及简析] D。 表示"在20世纪80年代"用in the 1980s表示。

816] Country music has become _____ in America.

[译文] 在美国，乡村音乐已经成为了一个大行业。

　 A. big business 　 B. a big business

　 C. big a business 　 D. businesses

[答案及简析] A。 business不可数名词，行当之意。

815] We haven’t had any success _____.

[译文] 到目前为止，我们还没有任何成功。

　 A. before long 　 B. so long

　 C. by far 　 D. so far

[答案及简析] D。 so far 常和现在完成时态连用。

814] The fact ______ he was successful proves his ability.

[译文] 他成功的事实证明了他的能力。

　 A. that 　 B. what

　 C. which 　 D. why

[答案及简析] A。 同位语从句。

813] You _____ a child. You can take careof yourself.

[译文] 你不再是小孩了。你能自己照料自己了。

　 A. no longer are 　 B. not any more are

　 C. are no longer 　 D. no more are

[答案及简析] C。 no longer 不再 常放在助动词或be动词后。

812] _____ she is young, she knows a lot.

[译文] 虽然她还小，她懂得很多。

　 A. When 　 B. However

　 C. Though 　 D. Unless

[答案及简析] C。 让步状语从句，"虽然"。

811] It was an exciting moment for these football fans this year, _____ for the first time in years their team won the World Cup.

[译文] 这是一个令足球迷们激动的时刻，多少年来这是他们的球队第一次获得世界杯。

　 A. that 　 B. while

　 C. which 　 D. when

[答案及简析] D。 非限制性定语从句，先行词是an exciting moment，在从句中充当时间状语。

810] The reason he has been so successful _____ he never gives up.

[译文] 他成功的原因是他从不放弃。

　 A. is because 　 B. is what

　 C. is that 　 D. is

[答案及简析] C。 reason 做主语，表语从句用that引导。

809] Many people agree that ____ knowledge of English is a must in _____ international trade today.

[译文] 许多人都同意英语知识是在国际贸易中的必备之物。

　 A. a; / 　 B. the; an

　 C. the; the 　 D. / ; the

[答案及简析] A。 a knowledge of 固定搭配"…的知识"，加冠词表示抽象名词的具体化。