Although the causes of cancer ____we do not yet have any practical way to prevent it.
#105341
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered
推荐题目
Though the medicine for my disease______, I should often______ at home or in the open air.
#105327
A
works out; work out
B
is working; work out
C
is working out; work
D
works; work
— ________ for the glass! —It’s OK. I’m wearing shoes.
#105336
A
Look out
B
Walk out
C
Go out
D
get out
Hurry up，kids！The school bus ________for us！ (2013·四川，3)
#105306
A
waits
B
was waiting
C
waited
D
is waiting
Since 1 won the big prize，my telephone hasn’t stopped ringing. People____to ask how I am going to spend the money.
#105338
A
phone
B
will phone
C
were phoning
D
are phoning
— Why do you do volunteer work in the North-West?— I_______ to improve the lives of the children there through my efforts.
#105303
A
was trying
B
have tried
C
am trying
D
tried