问题
                    
______the news, so far, has been good, there may be bad days ahead.
                            A:when
B:while
C:If
D:Since
                        
                        B:while
C:If
D:Since
正确答案是:
                        
                        
                        
                    同类题型
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I this book for two weeks. I have to return it now.
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