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Lily’s history report was hard. She spent two hours ＿＿＿ it last night.

A. do

B. did

C. doing

D. to do

She (read) a book when the phone (ring).

A. read / rang

B. was reading / rang

C. reads / rings

Which sentence emphasizes the duration of an action before another action in the past?

A. I had been studying for hours before the exam started.

B. I finished my homework before dinner.

C. I watched a movie last night.

D. I visited Paris last summer.

There projects have proved to be very _____ in dealing with global climate change

A. effectively

B. effect

C. effective

D. effects