问题
选择题
_____ by the killers whales, the whalers were able to make a successful kill.
A．To help out
B． Helped out
C．Helping
D．Being helped out
答案
答案：D
本题考查非谓语动词。being done 做原因状语，表被动和动作的同时进行，故选D。
搜题请搜索小程序“爱下问搜题”