——Yesterday, I didn’t see Ben at the party.   —— You _____ him. We just came back from Beijing this morning. 
#87561
A
mustn’t have seen
B
needn’t have seen
C
couldn’t see
D
can’t have seen
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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
___________, he would have been fired. 
#88131
A
Had he lied to the boss
B
Did he lie to the boss
C
If he has lied to the boss
D
If he lies to the boss