指示代词this/that的用法 — 英语选择题

教室里，小华站在讲台边。她指着离自己很近的黑板，又指着教室后排离她很远的一扇窗户。下面哪句话说得正确？A. This is a blackboard. That is a window. B. This is a window. That is a blackboard. C. This is a window. This is a blackboard. D. That is a blackboard. That is a window.