They are living with their parents for the moment because their own house __________.
#101270
A
has been rebuilt
B
is being rebuilt
C
is rebuilt
D
has rebuilt
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No one _______ the building without the permission of the policeman.
#100920
A
is leaving
B
will be leaving
C
has left
D
is to leave
--Why does the lake smell terrible? -- Because a large amount of water_______.
#99621
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
Since the recent river pollution in several provinces, people _______ more and more attention to the quality and safety of drinking water.
#100455
A
pay
B
are paying
C
have paid
D
have been paying
3. He is teaching in his hometown now, but he________ in a hospital for 10 years.
#104484
A
worked
B
has worked
C
had worked
D
has been working