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

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

A．is

B．are

C．being

D．to be

请帮忙给出正确答案和分析，谢谢！

您可能感兴趣的试题

I guess there are much less people in the Arctic regions than here.（英译中)

答案解析
Despite their lack of success so far, research scientists have ______ in their research fo

答案解析
Why is Jane worried about winter in the new location？A．It is much colder there.B．There are

答案解析
There is not much to choose between men. They are all a hotchpotch of greatness and little

答案解析
There are places in the world where people are alleged （被认为) to live much longer and re

答案解析
A.Life is quiet and relaxed.B.There isn much to do at night.C.People there are livin

答案解析
Researchers know there are many drugs that can alter our bodily processes in such a way【C1

答案解析