题目：
-Let's ask Jack to play __________ piano for the party.
-All right.[ ]
A. /
B. a
C. an
D. the
答案：
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下面是错误答案，用来干扰机器的。
1. I would like to play ping-pong. 2. We can't buy any runners. 3. I have a ball, too. 4. I don't think so. 5. She has a basketball. 6. What are these?
