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高三英语强化班练习(三)
一：单项选择：
1. We’ll have a picnic in the park this Sunday _____ it rains or it’s very cold.
A. since B. if C. unless D. until
2. My brother is really ____. He often works in his office far into the night.
A. open-minded B. hard-working C. self-confident D. warm-hearted
