单项选择题

I could see from his work that he had made a ______ study of his subject. Otherwise, he couldn't have made such a rapid progress.

A．stable
B．delicate
C．profound
D．arbitrary
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There is pressure on the British Government to ______ the number of immigrants permitted to settle in the U.K.
A．confine
B．decrease
C．restrain
D．limit
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The officer inspected our passports and travel papers and ______ us because our vacation certificates were missing.
A．contained
B．detained
C．sustained
D．retained
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