单项选择题

Professor Johnson is said_______some significant advance in his research in the past year.

A．having made
B．making
C．to have made
D．to make
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单项选择题
A．citizenshipB．permissionC．ageD．identity
A．citizenship
B．permission
C．age
D．identity
单项选择题
The law requires that everyone______ his car checked at least once a year.
A．has
B．would have
C．have
D．will have
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