单项选择题

A sheet of metal was shaken to ________ the sound of thunder.

A．stimulate
B．simulate
C．reproduce
D．duplicate
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单项选择题
When he bent down to tie his shoelace, the belt of his trousers ________.
A．ruined
B．cracked
C．broke
D．split
单项选择题
that it was going to rain, he took a raincoat with him.
A．Seeing
B．Saw
C．Seen
D．To see
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