问题

The life-saving drug invented in 1897, which ________ aspirin, has helped increase the standard of people’s health greatly.

A:was called
B:is called
C:has been called
D:had been called

正确答案是：

同类题型

I don’t want to end the friendship, but I hate others _______________.

There is a car _____ the bus.

Why did the police ______the crowd? — Because the president’ s car ______in the street.[ ]

Tom, please get some inkThere is________ink left in the bottle— OKI will [ ]

Although they are twins , Jack is __taller than Jim .