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Provide an example of a sentence in past perfect continuous tense.

A. He has been waiting for the bus for over an hour.

B. She was waiting for the bus for over an hour.

C. They will be waiting for the bus for over an hour.

D. She had been waiting for the bus for over an hour.

We need to protect ___________ from pollution.

A. environment

B. some environment

C. a environment

D. the environment

He ………………. to fix the old house.

A. tried

B. tryd

C. trid

Have you finished ……… that book yet?

A. to read

B. reading