指出下列句子中的通假字并解释它的意思
若一个几何体的主视图、左视图、俯视图分别是三角形、三角形、圆，则这个几何体可能是（ ）
如图为人体血液循环模式图，请据图回答：
— Has Tom finished his homework?
— Sorry, I don't know. He ________ it this morning when I saw him.
