单项选择题

They should have gone earlier, ______
A. have they B. didn't they G. haven't they D. shouldn't they

A．haven't they
B．shouldn't they
C．didn't they
D．They should have gone earlier, ______
E．have they
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There is something wrong with my ear, so I must have it ______.
A．checking
B．checked
C．to check
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Oxygen is one of the elements ______ water consists.
A．of which
B．of that
C．by which
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