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I wonder people could grow plants on Mars.

A. if B. that C. which D. whose

A 【解析】句意:我想知道是否人们能够在火星上种植植物。A. if是否;B. That引导宾语从句没有词义;C. which 哪个;D. Whose谁的。根据句意故选A。
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