【推荐1】My mother was doing the cleaning in the sitting room ________ the telephone rang.

A．when

B．while

C．since

D．as soon as

【推荐2】My son ________ computer games when I got home last night.

A．has played

B．was playing

C．will play

D．played

【推荐3】—What were you and Tom doing at this time yesterday?
—I was playing the piano _____________ Tom was walking his dog.

A．when

B．while

C．since

【推荐1】— What were the twins doing at the time of the rainstorm?
— Lily was making her way home ________ Lucy was shopping.

A．although

B．while

C．because

【推荐2】Virus can stay on our hands for long, so remember to wash your hands with some soap and water carefully ________ you come inside. It is the best way to fight novel coronavirus.

A．when

B．before

C．while

D．and

【推荐3】I got home _____ they were having dinner.

A．as soon as

B．while

C．because

D．After