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
After the funeral the widow and family spent several days in ______.
A．solitude
B．isolation
C．retirement
D．seclusion
单项选择题
Among the first to come and live in North America ______ , who later prospered mainly in New Eng- land.
A．were Dutch settlers
B．Dutch settlers had been there
C．Dutch settlers were there
D．had been Dutch settlers
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