--Lisa,whyareyoustillhere?Schoolisover.       --I

問題詳情：

-- Lisa, why are you still here? School is over.

        -- I ____ my classroom yet. I need fifteen more minutes.

        A: don’t clean       B: haven’t cleaned 

        C: didn’t clean     D: won’t clean

【回答】

B

知識點：動詞時態

題型：選擇題