Stop! You can never touch this machine when it ________, it is very dangerous.
#102729
A
has been operated
B
will be operated
C
is operated
D
is being operated
推荐题目
The Diaoyu islands, in the East China Sea between China and Japan, _______ to China since ancient times.
#101543
A
is belonged
B
have belonged
C
are belonging
D
Belonged
.The letter from his girlfriend he had been looking forward to _________yesterday.
#103526
A
came
B
comes
C
coming
D
come
A new cinema here . They hope to finish it next month.
#101379
A
will be built
B
is built
C
has been built
D
is being built
The computer looks old, but it _________ just half a year ago.
#104872
A
has been bought
B
will be bought
C
is bought
D
was bought
In the past decades, sea ice ______ in the Arctic as a result of global warming.
#100763
A
had melted
B
has been melting
C
melted
D
is melting