题目内容
My father always makes us _________ a lot of time _________ some math problems.
A. to spend; work on B. spending; working on
C. spend; working on D. to spend; to work on
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题目内容
My father always makes us _________ a lot of time _________ some math problems.
A. to spend; work on B. spending; working on
C. spend; working on D. to spend; to work on