5. Ronald Reagan had served two terms as governor of California before _________ President.
A. he became
B. when becoming
C. beca ame
D. did he become
答案:A
分析:before为状语从句引导词conj,后面一般引导一个完整的句子.B同时出现两个状语从句引导词,错;C缺主语;D应该为正常语序,选项中使用了倒装句式,错.
6. _________, domesticated grapes grow in clusters, range in color from pale green to black, and contain sugar in varying quantities.
A. Their botanical classification as berries
B. Although their botanical classification as berries
C. Because berries being their botanical classification
D. Classified botanically as berries
答案:D
分析:句子的主语是grapes , 后面是平行结构grow, range, and contain.空格后的句子已完整,那么空格处就应该是同位语,状语从句,分词等修饰成分.A中Their指代不明,而且classification和berries也不相符,错;B中Although为conj.,后面应该是完整句,错;C中Because为conj.,后面应该是完整句,错.
参考译文:培植的葡萄的植物分类跟浆果是一样的,它们成串的长在树上,颜色从灰白色到黑色,并且包含由不同数量的糖份.
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