问题补充：
—Good news. We will have aholiday. .
—I’ve heard of it. But it’s coming in .
A. three days; three days’ time
B. three days’; three days.
C. three-day; three days
D. three days; three-day time
答案：
A. three days; three days’ time
B. three days’; three days.
(答案→)C. three-day; three days
D. three days; three-day time
解析：句意：--好消息，我们将有一个三天的假期。---我已经听说了，但是它在三天后才到。a three-day holiday中，.three-day是复合形容词作定语，表示为期三天的。例如：一名10岁的男孩，a ten-year boy。in three days和in three days time意思一样，但它们不是三天之“内”的意思，而是三天以后的意思。例如：I’ll come back in three days.表达的意思我在三天后回来。因此选择C。
