Question

【题目】When they walked along the river，they suddenly heard somebody ________ for help．

A. called B. call C. to call D. calling

Answer 1

【答案】D

【解析】

试题分析：句意：当他们沿着河边走时，突然听到有人在求助。hear sb doing sth.听到某人正在做某事。依据语境理解，答案为D。