he was ill,_he couldn't join us in the spring outinga.in case b.in that case c.in which case d.in such a case为什么选C~

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he was ill,_he couldn't join us in the spring outinga.in case b.in that case c.in which case d.in such a case为什么选C~

he was ill,_he couldn't join us in the spring outinga.in case b.in that case c.in which case d.in such a case为什么选C~
he was ill,_he couldn't join us in the spring outing
a.in case b.in that case c.in which case d.in such a case
为什么选C~

he was ill,_he couldn't join us in the spring outinga.in case b.in that case c.in which case d.in such a case为什么选C~
必须选C.
因为此题考查“定语从句用法”
而一谈到定语从句,就只有“which”和“that”或者“不填”三个可能.
有了“,”就不能有“that”.
有了“,”,就要后面接“which”.
本题大意为:“他病了,因为他的病,他不能参加我们的春游”
他病了这件事是不能来的原因.至于为什么用“in”:
一种说法就是习惯用语.
二种说法就是:这个in是“in the case that”的一部分.也就是说,原句应该是:He couldn't join us in the spring outing in the case that he was ill.
而这句话反着说,就变成了He was ill,in which case he couldn't join us in the spring outing.

非限制性定于从句,不能用that只能用which

这是定语从句,先行词是he was ill, in which case 在那种情况下