[ Past Perfect or Past Perfect Continuous ]
When they received the message, they ________ for half an hour.
A. had been studying
B. had studied
C. had study

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A. kept
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What do you think if l join the debate competition in our school?
A. asking for an advice
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When my brother _____ he wants to be a football player
A. grow
B. grow up
C. bring up
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