问题
选择题
It was a time _____ the killer whales helped the whalers catch the baleen whales. [ ]
A. when
B. that
C. then
D. which
答案
答案：A
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It was a time _____ the killer whales helped the whalers catch the baleen whales. [ ]
A. when
B. that
C. then
D. which
答案：A