【題目】_____ people have done lots of research on moon, there is still much waiting to be discovered.

A. If B. Since C. Because D. Though

【答案】D

【解析】

句意：——盡管人們已經(jīng)在月球上做了許多調(diào)查，還有很多有待發(fā)現(xiàn)的地方。A. If如果；B. Since自從；C. Because因?yàn)椋?/span>D. Though盡管。根據(jù)下文there is still much waiting to be discovered可知上文是Though引導(dǎo)的讓步狀語(yǔ)從句。根據(jù)題意，故選D。

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