How many problems are there ____? [ ]A. work out B. to be worked out C. to work them out D. working

题目简介

How many problems are there ____? [ ]A. work out B. to be worked out C. to work them out D. working

题目详情

How many problems are there ____?

[     ]

A. work out
B. to be worked out
C. to work them out
D. working out
题型:单选题难度:中档来源:模拟题

答案

B

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