When he  _______ the door, he found his keys were nowhere.            
#104940
A
would open
B
opened
C
had opened
D
was to open
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The best way to prevent the air polluting _____ , but the sky is still not clear.
#102116
A
is used
B
are used
C
has been used
D
have been used
.But for the storm, we ______ earlier.
#103802
A
can arrive
B
will arrive
C
had arrived
D
could have arrived
Life abroad was not easy for him, and it was several years before he ________ the whole community.
#102091
A
had been familiar with
B
got familiar with
C
have been familiar with
D
would be familiar with