单项选择题

If the letter (to be mailed) was placed on the (writing) table an hour (ago), it is certain (will be) there now.

A. to be mailed
B. writing
C. ago
D. will be
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单项选择题
(In) warm-blooded animals, their body temperature, regardless of the temperature of the animals' (surroundings), (are) maintained within narrow (limits).
A. In
B. surroundings
C. are
D. limits
单项选择题
The discussion was so prolonged exhausting that ______ we had to stop for refreshments.
A．at large
B．at ease
C．at random
D．at intervals
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