It is getting dark. Take an umbrella ________ you regret it.
- A.
or
- B.
and
- C.
even
- D.
before
D
before的本意為“在……之前”，但這里含有否定的意思，表示“才不”．引導(dǎo)一個(gè)時(shí)間狀語(yǔ)從句．
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