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
解析试题分析：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。
考点：考查定语从句
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| A．where; which | B．which; in which | C．where; that | D．which; where |
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| A．where | B．that | C．when | D．which |
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| A．where | B．which | C．who | D．as |
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| A．which | B．whose | C．that | D．where |
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| A．that | B．which | C．as | D．when |
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| A．when; which | B．which; where | C．when; that | D．that; which |