Those black clouds are a sure _____ that it’s going to rain.
A.thingB.mark
C.signD.one
C
詞義辨析。Thing東西; mark標(biāo)志;sign 符號;跡象; one任何一個(gè)。句意:這些黑云肯定是要下雨的跡象。故選C。
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