答案B
in the evening (morning,afternoon) 是固定的,为一种泛指,但是具体某天上午或傍晚等要用介词on.如on a cold winter day,on Sunday afternoon,on the morning of Dec.20th"
答案B
in the evening (morning,afternoon) 是固定的,为一种泛指,但是具体某天上午或傍晚等要用介词on.如on a cold winter day,on Sunday afternoon,on the morning of Dec.20th"