We were stuck at the airport because of the heavy fog, otherwise we ________ here in time for the conference.
#86833
A
arrived
B
had arrived
C
would arrive
D
would have arrived
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 I should not have laughed if I ______ you were serious.
#86869
A
thought
B
would think
C
had thought
D
have thought
Tom_______show his exam results to his parents. 
#89881
A
dare not
B
dared
C
dare to
D
dares not to
 If I _______ that program the day before yesterday, my computer wouldn’t have broken down.
#86758
A
didn’t run
B
haven’t run
C
hadn’t run
D
were not to run