—I think trees ____________ twice a week in such hot weather.—Yes, I agree. Or they may die without water.
#36181
A
must water.
B
are watered.
C
must be planted.
D
must be watered.
推荐题目
An accident ________ on Zhongshan Road yesterday afternoon. 
#38538
A
has been happened
B
was happened
C
is happened
D
happened
The film began 10 minutes ago.
#38750
A
The film has begun for 10 minutes.
B
The film didn’t end 10 minutes ago.
C
The film has been on for 10 minutes.
D
The film has on 10 minutes.
 More than two schools          in the city next year.
#37157
A
are built
B
were built
C
have built
D
will be built