While building a tunnel through the mountain, ________ .
A.an underground lake was discovered |
B.there was an underground lake discovered![]() |
C.a lake was discovered underground |
D.the workers discovered an underground lake![]() |
Listen to the two girls by the window. What language_________.
A.did they speak | B.were they speaking |
C.are they speaking | D.have they been speaking |
My brother is an actor. He _____in several films so far.
A.appears | B.appeared | C.has appeared | D.is appearing |
Years ago we didn’t know this, but recent science ______that people who don’t sleep well soon get ill.
A.showed | B.has shown | C.will show | D.is showing |
Father ____ for London on business upon my arrival, so I didn’t see him.
A.has left | B.left | C.was leaving | D.had left |
They ______on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.
A.had been working; are still working | B.had worked; were still working |
C.have been working; have worked | D.have worked; are still working |