摘要：1．People, especially teens, think it great fun to surf on Internet．A．a, the B． a, / C．/, the D．the, the
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People, especially teens, think it great fun to surf on Internet.
| A．a; the | B．a; / | C．/; the | D．the; the |
People, especially teens, think it great fun to surf on Internet.
| A．a; the | B．a; / | C．/; the | D．the; the |
People, especially teens, think it __ great fun to surf on _____ Internet.
| A．a; the | B．a; 不填 | C．不填; the | D．不填；不填 |