I can’t quite remember ___ you started doing the work.
A.that is was when | B.when it was that | C.when was it that | D.that was it when |
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 |
I was glad to meet Jenny again, ______ I didn't want to spend all day with her.
A.but | B.and |
C.so | D.or |
(2013·北京卷)Many countries are now setting up national parks animals and plants can be protected.
A.when | B.which | C.whose | D.where |