（2017·温州）_____the scientists have done lots of research on Mars, there is still much waiting to be discovered.

题型：单选题题类：真题难易度：普通

2017年中考英语真题试卷（浙江温州卷）

_____the scientists have done lots of research on Mars, there is still much waiting to be discovered.

A、If B、Since C、Unless D、Though

举一反三

─ No, you call watching TV a hobby.

— I'd love to, ______________ I can't. I have to prepare for the English Speech Contest.

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