______your opinions are worth considering, the committee finds it unwise to place too much importance on them.

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问题 ______your opinions are worth considering, the committee finds it unwise to place too much importance on them.

选项 A、As
B、Since
C、Provided
D、While

答案D

解析 as可用来引导时间状语从句、方式状语从句和让步状语从句,分别意为“当……时候,随着……”,“正如”,“虽然,尽管”,该词引导让步状语从句时,从句要位于主句前,而且从句内容要倒装,例如:Successful as he is,he is not proud.他虽然成功了,却不骄傲。provided用来引导条件状语从句,意为“只要”,例如:I will lend you my bookprovided that you keep it clean.只要不把书搞脏,我会把书借给你。since常用来引导时间状语从句和原因状语从句,意为“自从;因为”,例如:He has written once since he left.他离去后曾来过一封信。连词while不但可以引导时间状语从句,而且还可以引导让步状语从句,作“尽管”讲,例如:English and French are living languages while Latin is dead.英语和法语是现在都有人说的语言,而拉丁语现在却没有人说了。
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