(单选题)

21.（）

A.covered with

B.locked by

C.chained to

D.marked with

参考答案：C

参考解析：

考查上下文语境和动词辨析。句意：在20世纪50年代，密歇根州贝乌拉附近一个拥有农场的家庭养了一头公牛，用链子拴在一棵榆树上。covered with意为“用……盖上”；locked by意为“被……锁着”；chained to意为“拴在……上”；marked with意为“用……标记”。根据后文“cut the chain”可知，此处应表示“拴在榆树上”。故选C。

知识点：

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