题干
We go to school at 7:00 __________ the morning.
A：in
B：on
C：at
D：of
答案(点此获取答案解析）
A
We go to school at 7:00 __________ the morning.
A：in
B：on
C：at
D：of
Cu＋H2O中，氧化剂是（ ）