题文
24. The Niagara Waterfalls, ______ is shaped like a semicircle, are 670meters wide, and fall 56 meters in an awesome white sheet of water.
| A．what | B．where | C．the largest of which | D．in which |
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24. The Niagara Waterfalls, ______ is shaped like a semicircle, are 670meters wide, and fall 56 meters in an awesome white sheet of water.
| A．what | B．where | C．the largest of which | D．in which |
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