Flying kites, ______ some researchers point out, can not only bring about joy to us, but also promote our physical and mental health.
| A．which | B．what | C．as | D．where |
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Flying kites, ______ some researchers point out, can not only bring about joy to us, but also promote our physical and mental health.
| A．which | B．what | C．as | D．where |
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