（年北京市西城区高三5月二模试题）31. A person who has never tasted bitter won’t know ______ sweet is.
| A．which | B．what | C．when | D．why |
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（年北京市西城区高三5月二模试题）31. A person who has never tasted bitter won’t know ______ sweet is.
| A．which | B．what | C．when | D．why |
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