— Why do you do volunteer work in the North-West?— I___ to improve the lives of the children there through my efforts.
#99543
A
was trying
B
have tried
C
am trying
D
tried
推荐题目
Ladies and gentlemen, please fasten your seat belts .The plane _____ .
#101606
A
takes off
B
is taking off
C
has taken off
D
took off
The plane___________at 11:05. 
#103570
A
takes off
B
took off
C
will take off
D
taking off
Food supplies in the flood-stricken area ______. We must act immediately before there’s none left.
#101593
A
have run out
B
are running out
C
have been run out
D
are being run out