单项选择题
I didn't sent our my application form last week,but I （）.
A.had to B.should have C.would do D.might have to
单项选择题 Many tourists were （） by the city 's complicated traffic system.
单项选择题 The political future of the president is now hanging by a （）.
单项选择题 By （） computation, he estimated that the repairs on the house would cost him a thousand dollars.
