[ Grammar ]
Which sentence uses the past continuous tense?
A. I am studying when the phone rings.
B. I will study when the phone rings.
C. I studied when the phone rang.
D. I was studying when the phone rang.

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Choose the correct tense for the following sentence: ‘They will be waiting for us when we arrive.’
A. Present tense
B. future indefinite tense
C. Future perfect tense
D. Future continuous tense
