情态动词表示推测 — 英语填空题
题目
Henry missed the 7:30 bus this morning, which left exactly on time. Since he never walks to school in the rain and the bus is the only transport available, he ___ have arrived at school before 8:00. (用表示推测的情态动词的适当形式填空，填缩略形式或完整形式均可)