(单选题)

30.（）

A.after

B.because

C.before

D.unless

参考答案：C

参考解析：

考查上下文语境和连词辨析。句意：农场主考虑做一件安全的事情：把它拔出来，在它死之前把它切成柴火。after意为“在……之后”；because意为“因为”；before意为“在……之前”；unless意为“除非”。根据前文“All of the elms lining the road leading to the farm became infected and died. Everyone thought that the old elm would be the next”可知，此处表示“在老榆树死亡之前”。故选C。

知识点：

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