正确答案，应该是 D.when
引导词做状语
relax在这里是不及物动词，没有宾语
注
是的
先行词被only, any, few, little, no, just, very, one of等词修饰时.引导词只用that (做宾语)
如1.The only thing that we could do was to wait.
2.That's the very word that is wrongly used.
The last place (that) we visited was the chemical works.
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