问题

The project will help people understand the many threats to the natural environment ________ endangered plants and animals live.

A:which
B:when
C:where
D:that

正确答案是：

同类题型

Please tell the students ________too much noise in class.

Why was the Great Wall built?— To ________ against enemies.[ ]

Would you like to climb mountains with me this Sunday—I’d love to. But I _______ play table tennis against Class Three.

Writing out all the invitations by hand was more time-consuming than we______.

Is John coming by train ? — He should, but he ______ not. He likes driving his car.