单项选择题

A．Dr. Lemon is waiting for a patient.
B．Dr. Lemon is busy at the moment.
C．Dr. Lemon has lost his patience.
D．Dr. Lemon has gone out to visit a patient.
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But we must keep in mind the billions of dollars we might spend carrying out the project
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A．relevantB．indoorC．flexibleD．inward
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