The flu is believed ______ by viruses that like to reproduce in the cells inside the human nose and throat.
#90948
A
to be caused
B
to have caused
C
being caused
D
causing
推荐题目
______ in 1885, this old car was the oldest one in the race.
#96625
A
Built
B
Being building
C
It was built
D
Having built
I can hardly imagine such a little boy ___ across the Nile.
#97327
A
swim
B
to swim
C
swimming
D
to have swum
______ once every two years, whether it is a car, a bus or a lorry, is the rule that all drivers must obey in our country.
#92782
A
Having been examined
B
Examined
C
Examining
D
Being examined
According to the engineer, there remain some tests _____ before the machine is put into operation.
#91175
A
carrying out
B
carried out
C
being carried out
D
to be carried out
----- Do you have clothes ______? I’ll wash them for you. ------No, thank you. I will wash them myself.
#97993
A
to be washed
B
to wash
C
washing
D
being washed