1.I didn't hear the phone.I __________ asleep.( )
A. | must be | B. | should have been | ||
C. | should be | D. | must have been |
20.People say that Vancouver is Canada's most beautiful city,_______by mountains and the Pacific Ocean.( )
A. | surrounded | B. | is surrounded | ||
C. | being surrounded | D. | surrounding |
19.On the wall at the entrance is a sign"No Photos",meaning that we _____take any photos in the museum.( )
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A. | needn't | B. | wouldn't | C. | don't have to | D. | mustn't |