Topics: Adverbial Clauses
When the boss walked into the office, his secretary ________.
A. is typing
B. was typing
C. has been typing
D. typed
Select your answer:

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Past Tenses › ViewWhich tense is often used with specific time expressions like “yesterday” or “last week”?
A. Past Simple
B. Past Continuous
C. Past Perfect Simple
D. Past Perfect Continuous
Possessive Adjectives VS Possessive Pronouns › View
That is_____
A. mine
B. my
