(2013·安徽師大附中高三七模)Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.
A．shallB．must
C．mayD．will
D
D　句意：如果油著火了不要用水來滅火，我們都知道油會浮在水的上面。will用于陳述真理性的事實。
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