( ),we must do wok on the machine A.For a machine to do wok B.For a machine doing wok

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( ),we must do wok on the machine A.For a machine to do wok B.For a machine doing wok

( ),we must do wok on the machine A.For a machine to do wok B.For a machine doing wok
( ),we must do wok on the machine A.For a machine to do wok B.For a machine doing wok

( ),we must do wok on the machine A.For a machine to do wok B.For a machine doing wok
选择A.for sb.to do sth 用作目的状语.