IwasreallytoobusywithmyhomeworkandIcouldn'thelp

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