单项选择题
He had gone away on business and would not return to the hotel until the next day. I should have to wait till （） I could thank him for the present.
A. afterwards B. then before C. then D. then therefore
单项选择题 Michael might have come to school in time for Professor Browning’s lecture （）
单项选择题 Just as too much harmony is tiresome in music （）
单项选择题 I had to get （） about the subject before I write the paper.
