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
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单项选择题
If he (was to come) here this afternoon, I (should ask) him to go to the party (held) by student (union).
A. was to come
B. should ask
C. held
D. union
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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