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I feel it hard to keep up with my classmates. But whenever I want to _______, my teacher always encourages me to work harder.

I feel it hard to keep up with my classmates. But whenever I want to _______, my teacher always encourages me to work harder.

A．give in            B．give back          C．give out           D．give up

I feel it hard to keep up with my classmates in study and sometimes I lose heart. But whenever I want to ________ , my teacher always encourages me to work harder.