If it __________for the snow, we ___________the mountain yesterday.
#86962
A
were not; could have climbed
B
were not; could climb
C
had not been; could have climbed
D
had not been; could climb
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It was Mr Zhang that helped us out of the trouble. Without his help, we ______ it so easily.
#87545
A
can’t manage
B
mustn’t have managed
C
couldn’t have managed
D
couldn’t manage
They must have been here the day before yesterday,____? 
#89896
A
mustn’t they
B
didn’t they
C
mustn’t have they
D
had they
This is his only request that the room_______ after being used.
#87382
A
be cleaned
B
would be cleaned
C
is cleaned
D
will be cleaned