—We all had a lot of fun at the barbecue yesterday. Pity you weren’t there. — I really should have gone with you, but I ________ on some remaining problems. 
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A
was working
B
would work
C
worked
D
had worked
推荐题目
 In general, most tennis ________ on hard courts or on clay.
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A
plays
B
is played
C
has played
D
has been played
In the war,the army  supplies during several months.
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A
furnish with
B
is furnished
C
is furnished with
D
are furnished at
The school board is made up of parents who ________ to make decisions about school affairs.
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A
had been elected
B
had elected
C
have been elected
D
have elected