单项选择题

Although it was not named______ 1782,this kind of metal was used as early as 5300 B.C.

A．for
B．in
C．until
D．since
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单项选择题
______ if he'd ever been fined before, Mathew replied, Only for speeding.
A．Asking
B．Asked
C．To ask
D．Having asked
单项选择题
Mack is very busy; he is a full-time student, while______ a part-time job.
A．to hold
B．being held
C．held
D．holding
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