New medicines and instruments ______ every day to extend life.
#105334
A
develop
B
are being developed
C
are developing
D
have developed
推荐题目
 Britain is being ________ in the race for new markets.
#105311
A
left alone
B
left out
C
left behind
D
left over
With more forests being destroyed, huge quantities of good earth ______ each year.
#105331
A
is washing away
B
is being washed away
C
are washing away
D
are being washed away
let’s go out now. It _____ any more. 
#105337
A
didn’t rain
B
doesn’t rain
C
won’t rain
D
isn’t raining