Dtwo 所以排除all (三者或三者以上)are 排除either(两者中任一.谓语动词用单数)C应该是them 而不是that先行词grammars,还原:both of (two grammars) are...
指物,作宾语,连词用which
Dtwo 所以排除all (三者或三者以上)are 排除either(两者中任一.谓语动词用单数)C应该是them 而不是that先行词grammars,还原:both of (two grammars) are...
指物,作宾语,连词用which