42 When fighting a wildfire, firefighters sometimes have to start a backfire to_____ the control lines.
(A)hinder
(B)loosen
(C)ripen
(D)widen

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統計： A(13), B(7), C(21), D(51), E(0) #1557570

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#5702166

widen 加寬

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(A)hinder阻礙(V) (B)l...
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