1 don't think he could have lost so much money last night,__?
A.did he | B.could he | C.do I | D.hasn't he |
I have heard a lot of good things about you ________ I came back from abroad.
A.since | B.until |
C.before | D.when |
There's no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
A.since | B.if |
C.as | D.while |
There are some health problems that, when ________ in time, can become bigger.
A.not treated | B.not being treated |
C.not to be treated | D.not having been treated |
In the global economy, a new drug for cancer, ________ it is discovered, will create many economic possibilities around the world.
A.whatever | B.whoever |
C.wherever | D.whichever |
Don't turn off the computer before closing all programs, ________ you could have problems.
A.or | B.and |
C.but | D.so |