问题

The phone had been ringing for three minutes before it

A:answered
B:had answered
C:was answering
D:was answered

正确答案是：

同类题型

May I speak to Jim, please—Sorry, ____ now.

The dog was approaching ________the garden when she ran out.

What shall we do this Sunday— Why ______to the Science Museum

As it reported, it is 100 years _____________ TsinghuaUniversity was founded.

He was asked to leave the company; ________,he was fired[ ]