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Hefounditnecessaryforus()fromeachother.a.tohelpandlearnb.helpingandlearningc.tolearnandtohelpd.learningandhelping选择并说明选它的理由

题目详情
He found it necessary for us ( ) from each other.
a.to help and learn
b.helping and learning
c.to learn and to help
d.learning and helping
选择并说明选它的理由
▼优质解答
答案和解析
A
find it necessary to do sth
learn from sb