Because the aircraft will finally end up in the water, it ______ be unsinkable and built entirely of environmentally friendly materials.
| A．can | B．may |
| C．must | D．Will |
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Because the aircraft will finally end up in the water, it ______ be unsinkable and built entirely of environmentally friendly materials.
| A．can | B．may |
| C．must | D．Will |
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