IwasreallytoobusywithmyhomeworkandIcouldn'thelp
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問題詳情:
I was really too busy with my homework and I couldn't help ____ ▲ ___ housework.
A. doing B. to do
C. did D. done
【回答】
B
知識點:非謂語動詞
題型:選擇題
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