Which sentence correctly uses the past perfect continuous tense to ...

★ Modals and Past Tenses

Which sentence correctly uses the past perfect continuous tense to indicate an action of certain duration with visible results in the past?

A. They had walked in the rain.

B. They were walking in the rain.

C. They had been walking in the rain.

D. They have been walking in the rain.

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Which sentence correctly uses the simple past tense to describe actions happening one after the other?

A. She was writing the letter and putting a stamp on it.

B. She writes the letter, puts a stamp on it, and posts it.

C. She wrote the letter, put a stamp on it, and posted it.

D. She had written the letter, put a stamp on it, and posted it.