[ Past Perfect vs Past Simple ]
My mom (come back) We (clean)
A. We had cleaned the house before my mom came back.
B. We have cleaned the house before my mom comes back.
C. We had cleaned the house before my mom come back.
D. We had cleaned the house, my mom came back.

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do / to / What / to / you / do / ?
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To signify a word within a sentence or state the title of a work, we use
A. double hyphens
B. quotation marks
C. parentheses
D. hyphens