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I’m not sure if it is.我拿不准。
I’m not at all sure if it is.我根本拿不准。
I’m not certain if it is.我拿不准。
I can’t say for certain.我说不准。
I’m not too sure of it.我不十分拿得准。中 华 考 试 网
I should think I heard some noise from above.我好像听到有人在上面出声。
I suppose it could be two o’clock at midnight.我猜那是在夜里2:00。
I think it was an American detective story or something like that.我想是一部美国侦探小说或类似(的书籍)。
