.Getting to other planets or to the moon _____ many problems.A.involveB.involvesC.involvingD.to invo

题目简介

.Getting to other planets or to the moon _____ many problems.A.involveB.involvesC.involvingD.to invo

题目详情


. Getting to other planets or to the moon _____ many problems.
A.involveB.involvesC.involvingD.to involve
题型:单选题难度:偏易来源:不详

答案

B

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