218.
The domesticated camel, which some scholars date around the twelfth century B.C., was the key to the development of the spice trade in the ancient world.
(A) The domesticated camel, which some scholars date
(B) The domesticated camel, which some scholars having thought to occur
(C) Domesticating the camel, dated by some scholars at
(D) The domestication of the camel, thought by some scholars to have occurred（D）
(E) The camel’s domestication, dated by some scholars to have been
我想问的是为什么主语是domestication的情况下，D后面还可以用have而不是has啊？
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