问题补充：
Don’t call me up at this time tomorrow, for I an important test.
A. will take
B. am taking
C. have been taking
D. will be taking
答案：
A. will take
B. am taking
C. have been taking
(答案→)D. will be taking
解析： 句意：明天这个时候，不要打电话给我，因为我将正在参加一个重要的考试。时间是at this time tomorrow,表示将来的某个时间正在做…，用将来进行时，所以选D。
