问题补充:
On Sunday I have to go to the farm my parents.
A. to help
B. help
C. helping
D. helped
答案:
(答案→)A. to help
B. help
C. helping
D. helped
解析:句意:周日我必须农场帮助我的父母,不定式做目的状语表示具体的将要进行的动作,结合语境可知选A。
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