I am busy ______ my homework these days after three day’s away.

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问题 I am busy ______ my homework these days after three day’s away.

选项 A、do
B、doing
C、in doing

答案B

解析 本题考查“busy”的用法。Be busy后应加动名词doing的形式。选项A为动词原形,选项C介词in多余,均不符合题意。只有选项B为动词现在分词形式,符合题意,故选B。
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