They ______ (to ride) their bikes before they ______ (to ...

★ Past Perfect vs Past Simple

They ______ (to ride) their bikes before they ______ (to meet) their friends.

A. rode, had met

B. had ridden, met

C. rode, met

D. had ridden, had met

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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.