Mountain climbing ________ be very tiring, and many people feel sick ________ the atmosphere gets th...
2022-12-19 14:34:18 46次 2015届山东省济宁市高一上学期期末模拟英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Mountain climbing ________ be very tiring, and many
people feel sick ________ the atmosphere gets thinner.
A．may; while B．can; as C．must; though D．should; for
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