问题
                    
Volunteering our time to help people ________ a good way to _______our free time.
                            A:be; spend
B:are; cost
C:is; spend
D:will; cost
                        
                        B:are; cost
C:is; spend
D:will; cost
正确答案是:
                        
                        
                        
                    同类题型
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