Question

【题目】— You must _____ a letter to your mother tomorrow.
— Well, I will, Dad.
A.write
B.to write
C.write to
D.writing

Answer 1

【答案】A
【解析】句意：——你必须明天给你妈妈写封信。——哦，我会的，爸爸。情态动词must后接动词原形。故选A。