Computers are so popular in our country that every pupil knows _____ e-mails.
| A．how can he send |
| B．how does he send |
| C．how to send |
| D．how sending |
Computers are so popular in our country that every pupil knows _____ e-mails.
| A．how can he send |
| B．how does he send |
| C．how to send |
| D．how sending |
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