英语 九年级 填空题 较难 ★ 精品

情态动词表推测 — 英语填空题

译林版·英语(初中) Unit 4 Life on Mars AI 三重审校通过

题目
Scientists are studying a strange light on Mars. It can't be a star because stars never move like that. Since nothing else in the sky moves in this way, the light ___ be a moving spaceship. (用适当的情态动词填空,表示肯定的推测)