When () your mother () you that blue dress, Mary?
A. does, buy
B. has, bought
C. had, bought
D. did, buy
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----Hi,Jim! Nice to meet you!----Hi, it is one year since I last () you.
A. saw
B. see
C. seeing
D. have seen
Smoking can increase the of developing heart disease.吸烟会增加得心脏病的危险。
Her strange behaviour has our suspicions.她的古怪行为引起了我们的怀疑。
How many vehicles were in the crash?这次撞车事故涉及多少辆汽车？
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