Despite much research, there are still certain elements in the life circle of th

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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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