Every day they worked hard ___ mornning till night.A.at B.from C.in D.on

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Every day they worked hard ___ mornning till night.A.at B.from C.in D.on
Every day they worked hard ___ mornning till night.A.at B.from C.in D.on

Every day they worked hard ___ mornning till night.A.at B.from C.in D.on
B from 从早到晚

目测是b 。每天他们努力工作,从白天到黑夜。

选B。因为句子后面有个till,till的意思是“直到……”,所以前面有个“从……”。这样句子才完整,所以选B。