﹣Hasyourfriendcompletedhisdesign？﹣Notyet．He

問題詳情：

﹣Has your friend completed his design？

﹣Not yet．He ________ on it last night．

A．worked     B．has worked      C．is working       D．was working

【回答】

D．

知識點：動詞時態

題型：選擇題