问题

.So often ______ inrecent years that it has almost become a rule.

A:has this happened
B:this has happened
C:is thishappening
D:for this to happen

正确答案是：

同类题型

, Jane has many advantages, too.——Oh, yes. _______ others are weak, she is strong.

（2018·北京）She and her family bicycle to work, _________ helps them keep fit.

．It’s not ____books you read but the way ____ you read them that decides how successfully you gain knowledge .

下列各句中，没有语病的一句是

Where is Mr Brown I have somequestions to ask him.—-He ______the office.