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  3. The period during (when) people (learned to) smelt iron is (called) (the) Iron Age.

The period during (when) people (learned to) smelt iron is (called) (the) Iron Age.

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问题 The period during (when) people (learned to) smelt iron is (called) (the) Iron Age.
选项 A、when
B、learned to
C、called
D、the
答案A
解析 应改为which。本题考查“介词+which”引导定语从句。注意when不用在介词后。
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