. Though I have often heard this song _______. I have never heard you _______ it.
| A．being sung, sang | B．sang, singing | C．sung, sing | D．to be sung, to sing |
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. Though I have often heard this song _______. I have never heard you _______ it.
| A．being sung, sang | B．sang, singing | C．sung, sing | D．to be sung, to sing |
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