选择题：[单选题,7.6分] Once environmental damage _________, it

题目内容：

[单选题,7.6分]
Once environmental damage _________, it takes many years for the system to recover.

A.has done
B.is to do
C.does
D.is done

参考答案：

You will probably _____ your team.s chance to win

You will probably _____ your team.s chance to win because you seem to have such

Not only ______ our money, but we were also in danger of losing our lives.　(A)：w

[单选题,7.6分] A group of sharks were ________ off the coast earlier this month. A.

[单选题,7.6分] In the smoke and dust and darkness, people ________ to one another gr

钢筋与混凝土这两种性质不同的材料能有效共同工作的主要原因是：　　　　　　　　（　　）(A)混凝土能够承受压力，钢筋能够承受拉力(B)两者温度