Question

【题目】He must _____ his sister with her math.

A. try help B. trying to help

C. tries to help D. try to help

Answer 1

【答案】D

【解析】

试题分析：句意：他必须设法帮助她的妹妹学数学。情态动词后加动词原形。try to do sth设法做某事。根据句意，故选D。