单选题 3. "Practice hard, and you will make progress." In this sentence the first clause is a ______ the second clause.

A、 consequence of
B、 contrast of
C、 comment on
D、 condition of

【正确答案】 D

【答案解析】 并列句连词。由and连接的并列句可以表述几种意义：因果关系、先后顺序、对比、评注、条件。例如：
He heard an explosion and he phoned the police.
She washed the dishes and she dried them.
Robert is secretive and David is candid.
They disliked John—and that's not surprising.
Give me some money and I'll help you escape.(=If you give me some money，I'll help you escape.)