Question

【题目】 I often doubt _________David is willing to help those homeless people.

A. whether B. that C. when D. how

Answer 1

【答案】A

【解析】

试题分析：句意：我常常怀疑是否大卫愿意帮助那些无家可归的人。A. whether是否；B. that 宾语从句的连接词；C. when 何时；D. how如何。doubt表示疑问，排除B，结合句意理解，故答案为A。