Despite much research, there are still certain elements in the life circle of the insect that ______ not fully understood.

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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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