For the engine to work, the green button        be in the “on” position.
A．canB．wouldC．mustD．might
C
考查情態(tài)動詞。Can能，可能；would將要，愿意；must必須，一定；might可能，也許。句意：為了機器能工作，這個綠色的按鈕必須在“on”的位置。故選C。
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