单项选择题

The incredible precision of the equipment is ______ to the mechanical skill of the engineers who built it.

[A] testimony
[B] symbol
[C] evidence
[D] attribute
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This type of apparatus can produce more than 40,000 blood ______ a day.
[A] examples
[B] models
[C] samples
[D] specimen
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Our picnic ______ by the unexpected heavy rain, we went home depressed.
[A] was spoiled
[B] had been spoiled
[C] having spoiled
[D] having been spoiled
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