问题
选择题
231. The old man is used to sleeping without a ________in order to keep his back from bending.
A．net
B．pillow
C．slippers
D．Quilt
答案
B
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231. The old man is used to sleeping without a ________in order to keep his back from bending.
A．net
B．pillow
C．slippers
D．Quilt
B