题目内容
The moment ______Leo will never forget is ______he joined the Air Force
| A．when; that | B．that; that | C．that; when | D．when; / |
C
解析试题分析：句意：Leo永远不会忘记的那一刻是他加入空军的时候。第一个是定语从句，修饰moment，关系代词做宾语，用that或which;第二个是表语从句，引导词做时间状语，用when。故选C。
考点：考查从句中的引导词。
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| A．that although | B．that even | C．that as | D．whether |
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| A．How | B．Because | C．If | D．While |
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| A．as long as | B．as if | C．now that | D．in order that |
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| A．that | B．which | C．in which | D．at which |
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| A．That | B．Where | C．What | D．Why |
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| A．when | B．where | C．for which | D．why |
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| A．in case | B．where | C．in which | D．that |