单项选择题
Michael might have come to school in time for Professor Browning’s lecture ()
A. ff he got up earlier B. unless he had got up earlier C. but he had gotten up so late D. but he got up rather late
单项选择题 I had to get () about the subject before I write the paper.
单项选择题 Economies, several courses of which I have taken thus far, () to be difficult but useful for almost all students.
单项选择题 The bedroom is in perfect condition, () a few scratches on the wall.