___________is often the case, we complete the task
ahead of time.
1. as
2. which
上網查過之後，得知 as is often the case
意思是 常有的事，這很常見 等意思。
但是，看到這個網頁教學，又覺得混淆
http://ppt.cc/U-de
到底是，其實省略了一個先行詞which
as (which) is often the case....這樣嗎?
還是說
as is often the case, = which is often the case,
如果可以這樣替換，那上面那題文法選擇
1和2都可以了。
我查which is often the case, 沒有查到相關
意思。
還請各位高手幫幫我，感激不盡！
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