题目内容
Bears_____ fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.
A.pack up | B.build up | C.bring up | D.take up |
B
解析

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题目内容
Bears_____ fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.
A.pack up | B.build up | C.bring up | D.take up |
B
解析