单项选择题
17（）
A．keep off
B．ask for
C．depend on
D．try on
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16（）
A．copies
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Mack is very busy; he is a full-time student, while______ a part-time job.
A．to hold
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C．held
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-Who is late this time -______you ask Susan, of course.
A．Could
B．Can
C．Need
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