19 According to the author, humans invented different time-keeping instruments in order to .
(A) wake up a person on time
(B) measure time in equal units
(C) make good use of time
(D) emphasize the importance of time

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統計： A(16), B(414), C(73), D(34), E(0) #546541

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#1889037
measure time in equa...
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#3610231

unit 單位,分隊,部隊,單元,部件,裝置(a.)單位的,單元的.

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