I ________ when my boss walked in my office. I ...

[ Grammar ]

I ________ when my boss walked in my office. I was on Facebook.

A. wasn´t working

B. didn´t working

C. wasn´t worked

D. worked

Select your answer:

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You ______ only use the computer at the library if you have a library card.

A. don’t have to

B. mustn’t

C. shouldn’t

D. may