_____ he is very busy, he spends at least two hours every day surfing the Internet in order to find out the latest development in science and technology.
| A．Even though | B．When | C．Unless | D．Whether |
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_____ he is very busy, he spends at least two hours every day surfing the Internet in order to find out the latest development in science and technology.
| A．Even though | B．When | C．Unless | D．Whether |
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