With the help of high technology, more and more new substances____in the past years.
A.discovered | B.have discovered | C.had been discovered | D.have been discovered |
The boy ought to have gone to school ___, but he slept ___noon.
A.in the morning, at | B.that morning, at |
C.in that morning, until | D.that morning, until |
The train leaves at 6:00 p.m. So I have to be at the station ____5:40p.m.at the latest.
A.until | B.after | C.by | D.around |
I saw Jack yesterday. He told me that he would stay here _____ the end of this year.
A.at | B.by | C.for | D.till |
_____ defeated, they didn't lose heart.
A.In spite of | B.Except for | C.Though | D.Until |
---May I attend your lecture, Mr. Green?
---Welcome _____ open arms.
A.with | B.by | C.in | D.for |