—John,couldyoucomeandhelpmeinthekitchen,please?—Sorry,M...

問題詳情：

— John, could you come and help me in the kitchen, please?

— Sorry, Mum. I_________ Tom search for information on the net.

A．help              B．helped                 C．have helped        D．am helping

【回答】

D

知識點：動詞時態

題型：選擇題