done和being done的用法比较

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Q1:____ twice a year, whether it is a car or bus or a truck, is the rule that every driver must obey in this city.

A. Examined

B. Examining

C. Having been examined

D. Being examined

Q2:A truck ____ twice a year can keep in good condition.

A. examined

B. examining

C. having been examined

D. being examined

done和being done的用法比较

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