单项选择题

Tom is always lack of self-confidence. His ______ character called him to miss many golden opportunities.

A．diffident
B．ignorant
C．proud
D．conceited
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单项选择题
Jenny s wealth of practical experience and psychological acuity (sharpness) ______ more than her lack of formal academic training.
A．compensate for
B．account for
C．speak volumes for
D．make for
单项选择题
To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to the world market demand.
A．improve
B．enhance
C．guarantee
D．gear
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