Question

Newton was playing under an apple tree ____ an apple fell onto his head.

A. when B. while C. after D. before

Answer 1

A

【解析】

试题分析：句意：牛顿正在苹果树下玩，这时候一个苹果掉到他的头上。A. when ，连词，当……时候；B. while连词，当……时候；C. after 连词，在……以后 ；D. before连词，在……以前。under an apple tree在苹果树下fell onto，掉到……上。根据句意，故选A.

考点：考查连词用法。