问题
选择题
Only in that way _____ find out how this kind of animal lived and then finished the research on time.[ ]
A. could they
B. they could
C. did they
D. they were able to
答案
答案：A
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Only in that way _____ find out how this kind of animal lived and then finished the research on time.[ ]
A. could they
B. they could
C. did they
D. they were able to
答案：A