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despite much research,there _____still certain elements in the life cycle of the insectthat ____not fully understood. A is,is B is,are C,are,is Dare,are
题目内容：
despite much research,there _____still certain elements in the life cycle of the insect
that ____not fully understood. A is,is B is,are C,are,is Dare,are优质解答
选C 前面的elements 复数形式 用 are 后面 的life cycle 用单数
despite much research,there _____still certain elements in the life cycle of the insect
that ____not fully understood. A is,is B is,are C,are,is Dare,are
that ____not fully understood. A is,is B is,are C,are,is Dare,are
优质解答
选C 前面的elements 复数形式 用 are 后面 的life cycle 用单数
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