Wehadbetternotbotherourprofessorthesedays,forheisawful...

問題詳情：

 We had better not bother our professor these days, for he is awfully busy preparing a report _____ at an international conference next month.

     A. being delivered         B. to be delivered  C. to deliver             D. delivered   

【回答】

B

知識點：非謂語動詞

題型：選擇題