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  3. The teacher was busy ______ sums upon the blackboard. She was too busy ______ the students’ questions.

The teacher was busy ______ sums upon the blackboard. She was too busy ______ the students’ questions.

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问题 The teacher was busy ______ sums upon the blackboard. She was too busy ______ the students’ questions.
选项 A、to write out; answering
B、to write out; to answer
C、writing out; to answer
D、writing out; answering
答案C
解析 本题为句型搭配。be busy doing something 意为“忙于做某事”；too busy to do something 意为“太忙碌以至于不能做某事”。本题大意为：老师忙着在黑板上写算术题，她太忙了，没法回答学生的问题。
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