(单选题)

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A.clean

B.separate

C.loosen

D.remove

参考答案：A

参考解析：

考查动词词义辨析和上下文语境。句意：必须清理刹车。clean意为“打扫，清洗”；separate意为“分离，分开”；loosen意为“放松，松开”；remove意为“移开，去掉”。根据上文的“there is a piece of chewing gum stuck to a brake”可知，Sam的自行车车闸上粘上了口香糖，因此他应该清洗刹车。故选A。

知识点：

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