2. 职称英语
  3. Despite much research, there are still certain elements in the life circle of th

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

游客2023-10-27  56
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 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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