—Remember the first time we met, Jim?
—Of course I do. You in the library.
A.were reading | B.had read | C.have read | D.read |
As we know, penicillin became the greatest drug of the 20th century, ______ millions of lives.
A.to save | B.saving | C.saved | D.Save |
—How long _______ in Shanghai?
—I will be there attending a conference and giving a speech, which will take about 3 days.
A.have you stayed | B.are you staying | C.do you stay | D.did you stay |
If he _______ the opportunity at that time, he would be the new department manager now.
A.seized | B.should seize | C.has seized | D.had seized |
To everyone’s amazement now, technology ________ faster than most people can keep pace with.
A.is changing | B.will change | C.changes | D.has changed |
It was not until the early 1950s ______most tape recorders began using plastic tape as they do today.
A.when | B.which | C.that | D.Before |