[ Grammar ]
Ploysodsai _____ for 2 hours by the time her parents come back.
A. will have swam
B. was swimming
C. has been swimming

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____ is that person over there?
A. What
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The following expressions are formal, except …
A. I was wondering if I could borrow it
B. would you mind sending it again?
C. see you soon
D. I look forward to seeing you
