____twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.
#98186
A
Examining
B
Examined
C
Being examined
D
Having been examined
推荐题目
Most computer users think it necessary for their software ________ regularly．
#89719
A
to up date
B
to be updated
C
to have been up dated
D
to have updated
___________ his poem, he didn’t dare to submit it to the professor.
#94509
A
Not having polished
B
Having not polished
C
Not polished
D
Not being polished
Everyone here will thank the firefighters for the things they have done to prevent fires _______ the environment safer.
#98466
A
make
B
to making
C
to make
D
from making
The film on the novel by Simpson has got the first prize in the Oscar film festival.
#96702
A
based
B
basing
C
bases
D
being based
great efforts to practice English, Mary has made much progress in spoken English.
#95233
A
To make
B
Having made
C
Made
D
Making