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(dòng)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(jī)器能工作,這個(gè)綠色的按鈕必須在“on”的位置。故選C。
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