The traffic at the rush hour is very __________ and slow.
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Venice is an __________ city on water.
Millions of __________ visit Vienna every year.
Choose the best answer.选择正确答案。—Have you ever been to Shanghai?—Yes. I __________ there last summer.
A. have been
B. went
C. go
I __________ a lot of beer when I visited Qingdao.
A. was drinking
B. had drunk
C. drank