--Do you often hear John ___ in his room? --Yes. Listen! Now we can hear him ___ in his room.
| A．sing; to sing | B．singing; singing | C．sing; singing | D．to sing; singing |
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--Do you often hear John ___ in his room? --Yes. Listen! Now we can hear him ___ in his room.
| A．sing; to sing | B．singing; singing | C．sing; singing | D．to sing; singing |
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