新世界：2008年12月四级翻译答案

新世界英语2008年12月四级翻译
87. Medical researchers are painfully aware that there are many problems (that/which) they haven't been solved yet.
88. What most parents are concerned about is proving the best education possible for their children.
89. You'd better take a sweater with you in case it becomes chilly.
90. Through the project, many people have received training and decided to explore their own enterprise。
91. The anti-virus agent was not known until a doctor accidentally found it.

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