The Aztecs underwent a period of training under the Toltecs,______the agricultural practices of the other culture.

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问题 The Aztecs underwent a period of training under the Toltecs,______the agricultural practices of the other culture.

选项 A、were learning
B、which learning
C、in which they learned
D、they learned

答案C

解析 The sentence needs an adjective structure to modify a period of training under the Toltecs. The answer, in which they learned, is the beginning of an adjective clause.
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