单项选择题

All the investigations ______ before the deadline, the staff decided to have a party as a celebration.

[A] been fulfilled
[B] had been fulfilled
[C] were fulfilled
[D] having been fulfilled

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单项选择题

My father always hopes that I could ______ with his friends’ children but I prefer to stay alone.

[A] blend
[B] mingle
[C] merge
[D] combine

单项选择题

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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