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Becoming aware of our mother’s age, not just in numbers of years but      her psychological and physical state, often helps us understand her better.

A．in spite of               B．on account of             C．in terms of          D．by means of

Becoming aware of our mother's age, not just in numbers of years but _____ her psychological and physical state, often helps us to understand her better.

A. in spite of　 B. on account of　 C. in terms of　 D. by means of