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  3. Despite much research, there are still certain elements in the life cycle of the insect that _____not fully understood.

Despite much research, there are still certain elements in the life cycle of the insect that _____not fully understood.

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问题 Despite much research, there are still certain elements in the life cycle of the insect that _____not fully understood.
选项 A、are
B、were
C、is
D、was
答案A
解析 这里由引导的定语从句修饰复数名词elements，所以定语从句中的that代替的复数意义的名词，其谓语应该用复数形式；这里谈到的是现实存在的事实，排除B项。
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