单项选择题

The discussion was so prolonged and exhausting that ___________the speakers stopped for refreshments.

A．at large
B．at intervals
C．at ease
D．at random
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单项选择题
The number of registered participants in this year's marathon was half ____________.
A．of last year''s
B．those of last year''s
C．of those of last year
D．that of last year''s
单项选择题
He does not ___________as a teacher of English as his pronunciation is terrible.
A．equal
B．match
C．qualify
D．fit
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