问题

The big fire in Shanghai, believed to ______ due to the burning of construction materials, caused
A:have occurred
B:occur
C:have been occurring
D:be occurring
B:occur
C:have been occurring
D:be occurring
正确答案是:
同类题型
What should we do now, Mr. Clark?——Please turn to Page_____and look at the_____picture.
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I think the car was invented _____ 1885.[ ]
The police failed to come up with ______ evidence, and on that account the suspect was released.