单选题ATwo to four months.BAbout three weeks.CAt least half a year.DTwo years or more.

单选题
A

Two to four months.

B

About three weeks.

C

At least half a year.

D

Two years or more.


参考解析

解析:
细节题。录音中“which can take two to four years”说明答案为D。

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