题目内容
Cheer up! Everyone may have periods in their lives everything seems tough.
| A.which | B.where | C.when | D.that |
C
试题分析:考查定语从句。which/that作主语或宾语;where作地点状语;when作时间状语;先行词是periods“时期”,指时间,而且定语从句不缺少成分,因此用when引导定语从句。故选C。
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