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题库 / Prep2007E1-SC-140
In human hearing, subtle differences in how the two ears hear a given sound help the listener determine the qualities of that sound.
in how the two ears hear a given sound help the listener determine
in the two ears hearing a given sound help the listener in determining
in how a sound is heard by the two ears helps the listener determine
between how the two ears hear a given sound helps the listener in determining
between how a sound is heard by the two ears help the listener in determining
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B: differences in the two ears，原句其实在比较两只耳朵听到的sound的差别， a difference in ……
Idiom: help do sth. / help to do sth. / help sb. do sth. / help sb. to do sth. / help in doing sth.
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