The question of why prehistoric animals became extinct has not been
conclusively
answered.
A、
decisively
B、
extensively
C、
especially
D、
predominantly
【正确答案】
A
【答案解析】
解析：题干中conclusively“决定性的”，选项中decisively“决定性的”，extensively“广 泛的”，especially“特别的”，predominantly“显著的”，选项A最接近题干意思。
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