Every year lots of trees ____________ to make our country more beautiful.
#44817
A
is planted
B
was planted
C
are planted
D
were planted
推荐题目
Many accidents_____ by careless drivers last year. 
#44673
A
are caused
B
were caused
C
have caused
D
will cause
Food safety is important. Rules ______ to stop people from food pollution.
#44926
A
must make
B
must be made
C
can’t make
D
can’t be made