问题

Taxi booking apps_______ available for more than a year in some cities in Henan province since 2013.

A:are
B:were
C:will be
D:have been;

正确答案是：

同类题型

Only when _____ possible to settle the problem how to get the machine repaired

It is generally accepted that swimming ________ good health

______ is Gina. She is ______ good friend.

The happiest of people don’t ______ havethe best of everything; they just make the most of everything that comes alongtheir way.

_____ are in the army.