单项选择题

The young captain understood that someone ______ the bronze ring from him, and he lament- ed his misfortune loudly.

A. must have stolen
B. must be stealing
C. must steal
D. must have been stealing
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The old and infirm master will give a great reward to ______ will cure him and give him back the strength of his youth.
A. who
B. whoever
C. what
D. whatever
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In learning a technique, ______ it chemistry or life itself, mastery of the methods is the only important thing.
A. be
B. either
C. no matter
D. whatever
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