He must _____ his sister with her math.A．try helpB．tryin Wap版

试题详情及答案解析

He must _____ his sister with her math.

A．try help	B．trying to help
C．tries to help	D．try to help

答案：D

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。
考点：考查动词的用法。