第一节 单项填空(共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21. -Mum, please tell me the answer to
this maths problem.
-_______. You are a senior student
and I can’t help you all the time.
A.
That’s all right
B. That’s out of the question
C. Wait a moment
D. It’s none of my business