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9、I heard him ________ in the hall when I passed by.

A.to practise singing                                      B.practise singing

C.practising singing                                       D.practise to sing

9、C

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I heard him ________ in the hall when I passed by.

A.to practise singing                                      B.practise singing

C.practising singing                                       D.practise to sing

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