(The domesticated camel, which some scholars date) around the twelfth century B. c., was the key to teh development of the spice trade in the ancient world.
D. the domestcation of the camel, thought by some scholars to have occured
答案选D， 可是 around the twelfth century B.C. is past tension, why use have occured?
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发表于 2003-6-6 00:08:00
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