【題目】— Excuse me, sir. I'm afraid you can't smoke here. This is non-smoking area.
—Oh, sorry. I ____________ the sign.
A.don't see
B.didn't see
C.didn't saw
D.saw

【答案】B
【解析】句意：--打擾一下，先生。恐怕你不能在這兒吸煙。這里是無煙區(qū)。--哦，真抱歉，我沒看見指示牌。結(jié)合語境，推知對話發(fā)生在現(xiàn)在，而沒看見標(biāo)識牌是發(fā)生在過去，應(yīng)該使用一般過去時態(tài)。根據(jù)句意及結(jié)構(gòu)，故選B。

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