Not until actually ________ with water shortage ________ appreciate the value of water to a region.
| A．facing; one can | B．faced; can one | C．faced; one cannot | D．facing; cannot one |
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Not until actually ________ with water shortage ________ appreciate the value of water to a region.
| A．facing; one can | B．faced; can one | C．faced; one cannot | D．facing; cannot one |
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