题目内容
【题目】He must ______ his sister with her math.
A. try helpB. trying to helpC. tries to helpD. try to help
【答案】D
【解析】
试题句意：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。
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题目内容
【题目】He must ______ his sister with her math.
A. try helpB. trying to helpC. tries to helpD. try to help
【答案】D
【解析】
试题句意：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。