单项选择题

It is essential that all the details in this case ______ first.

A．is investigated
B．was investigated
C．be investigated
D．shall be investigated
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单项选择题
President John Kennedy was ______ in Dallas in 1963.
A．slaughtered
B．assassinated
C．suicided
D．massacred
单项选择题
A large bird was watching us intently from the top of a ______ van.
A．stationing
B．stationed
C．stationery
D．stationary
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