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Despite much research, there are still certain elements in the life circle of the insect that ______ not fully understood.
Despite much research, there are still certain elements in the life circle of the insect that ______ not fully understood.
admin
2013-12-13
82
问题
Despite much research, there are still certain elements in the life circle of the insect that ______ not fully understood.
选项
A、is
B、are
C、being
D、to be
答案
B
解析
主谓一致题。此空所在的部分为that引导的定语从句,先行词为elements,根据主谓一致的原则,定语从句中的谓语动词应和先行词保持一致,故B项are正确。
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专业英语四级
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