★ Past Perfect and Past Perfect Continuous Tense
What do we need to add to the main verb in the Past perfect continuous tense?
A. -s
B. -ed
C. -er
D. -ing
Preview next quiz:
As soon as Betty ………………………………………. the door, the burglar alarm went off. (open)
A. opened
B. had opened
C. was opening
D. had opended
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