摘要： They were surprised that a four-year-old boy should work out such a difficult problem they themselves couldn’t. A. once B. which C. while D. where
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They were surprised that a four-year-old boy should work out such a difficult problem ____ they themselves couldn’t.
A. once B. then C. while D. if
查看习题详情和答案>>They were surprised that a four-year-old boy should work out such a difficult problem ____ they themselves couldn’t.
A. once B. then C. while D. if
查看习题详情和答案>>They were surprised that a four-year-old boy should work out such a difficult problem ____ they themselves couldn’t.
A. once B. then C. while D. if
查看习题详情和答案>>