单项选择题

Jack ______ from home for two days now, and I am beginning to worry about his safety.

A．has been missing
B．has been missed
C．had been missing
D．was missed
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单项选择题
The head of the museum was ______ and let us actually examine the ancient manuscripts.
A．promising
B．agreeing
C．pleasing
D．obliging
单项选择题
The experiment requires more money than ______.
A．have been put in
B．being put in
C．has been put in
D．to be put in
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