单项选择题

He was ______ on the telephone so I asked him to speak more clearly.

A．muttering
B．compiling
C．groping
D．certifying
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单项选择题
When the engine finally started she gave a(n) ______ sigh of relief.
A．adaptable
B．sensible
C．audible
D．applicable
单项选择题
Our new director is much younger than his ______, who is already 50 years old.
A．successor
B．precedent
C．predecessor
D．offspring
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