I wonder people could grow plants on Mars.

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

A 【解析】句意：我想知道是否人們能夠在火星上種植植物。A. if是否；B. That引導(dǎo)賓語從句沒有詞義；C. which 哪個(gè)；D. Whose誰的。根據(jù)句意故選A。
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