Tom ________ in the library every night over the last three months.(2011·北京)

A．works  B．worked

C．has been working  D．had been working

In order to find the missing child，villagers ________ all they can over the past five hours.(2012·安徽)

A．did  B．do

C．had done  D．have been doing

—Hi, Susan, where were you at lunch time？I ________ a seat for you in the coffee shop.

—Oh, sorry to miss you.My political science class ran longer than usual.

A．am saving  B．was saving

C．had saved  D．have saved

—Mum, you should have taken me to the park this morning.

—I had planned to, but I couldn't afford the time.I ________ a lecture.

A．had given  B．gave

C．was giving  D．would give

—When did the computer crash?

—This morning，while I ________ the reading materials downloaded from some websites.(2012·福建)

A．have sorted  B．was sorting

C．am sorting  D．had sorted

After school we went to the readingroom to do some reading，only to be told that it ________.(2012·安徽)

A．was decorated  B．had decorated

C．had been decorating  D．was being decorated

—Joan，what ________ in your hand?

—Look！It's a birthday gift for my grandma.

A．had you held  B．are you holding

C．do you hold  D．will you hold

I'll go to the library as soon as I finish what I ________.

A．was doing  B．am doing

C．have done  D．had been doing

“The moment ________ soon”，he thought to himself，waiting nervously.(2012·湖南)

A．came  B．has come

C．was coming  D．is coming

—I'm not finished with my dinner yet.

—But our friends ________ for us.(2010·北京)

A．will wait  B．wait

C．have waited  D．are waiting