问题补充：
We usually take turns cleaning ,and today it is my turn it
A. to do; doing
B. doing; doing
C. doing ;to do
D. to do ;to do
答案：
A. to do; doing
B. doing; doing
C. doing ;to do
(答案→)D. to do ;to do
解析：本题考查短语搭配。句中考查take turns to do轮流做某事；it is one’s turn to do轮到某人做某事。句意：我们通常轮流打扫，今天轮到我打扫了。
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