题目内容
_________ in recent years that it has almost become the rule.
- A.So often for this to happen
- B.So often is this happened
- C.So often this has happened
- D.So often has this happened
D
练习册系列答案
相关题目
There is no doubt _________ the world climate has been changing in recent years.
A.that |
B.what |
C.if |
D.whether |