These techniques were applied over the centuries.

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问题 These techniques were applied over the centuries.

选项 A、employed
B、explored
C、manipulated
D、innovated

答案A

解析 句意:这些技巧已经被采用了几个世纪。apply与employ都可以表达“采用,应用”的意思。explore探险,探索。manipulate操作,操纵。innovate改革,创新。
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