―Look! What a mistake! Why?
―Sorry, I _________ on it．
| A．don’t concentrate | B．hadn’t concentrated |
| C．haven’t been concentrating | D．wasn’t concentrating |
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―Look! What a mistake! Why?
―Sorry, I _________ on it．
| A．don’t concentrate | B．hadn’t concentrated |
| C．haven’t been concentrating | D．wasn’t concentrating |
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