Question

__the morning they usually do sports. But___ yesterday morning they cleaned their
A. In, on        B. In, /        C. On, on

Answer 1

A

試題分析：泛指在早上，英語為in the morning，具體到某一天要用介詞on。句意：通常他們早上運動。但是在昨天他們打掃了房間。故選A。