单项选择题

He ________ in the next room.

A. is often heard to sing
B. often heard to sing
C. is often heard sing
D. is often hearing to sing

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单项选择题

Both _________ took part in the game.

A. an old and a young
B. old and young
C. the old and young
D. an old and young

单项选择题

Let's be incredibly gracious and suppose that you know 1% of everything ________ to know.

A. it is
B. as is
C. there is
D. what is

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