The medical worker，along with his colleague，________ thousands of citizens in the last three years.（　　）

A．serves	B．served
C．have served	D．has served

【答案】D

【解答】

【點(diǎn)評(píng)】

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A．were made	B．have made
C．a(chǎn)re made	D．have been made

A．will be increasing	B．has increased
C．were increasing	D．have increased

The medical worker，along with his colleague，________ thousands of citizens in the last three years.（ ）