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The girl was often heard happily in her room. A. sing B. to sing C. singing D. sings 【查看更多】

 

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 The girl was often heard ______ happily in her room.

   A. sing               B. to sing       C. singing        D. sings

 

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The girl was often heard _______ happily in her room.

A. sings  B. sing  C. singing  D. to sing

 

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The girl was often heard _______ happily in her room.

A．sings B．sing C．singing D．to sing 

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The girl was often heard        happily in her room.

A．sing                 B．to sing             C．singing              D．sings

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The girl was often heard ________ happily in her room．

[　　]

A．sing

B．to sing

C．singing

D．sings

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