39.While photosynthesis in green plants, light energy is captured and used to convert
A B C
water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
D
请教各位:
这题答案是A,但是不知道应该怎样改。
谢谢
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the rules are: prepositon + noun. which + sentence
thus, while ----- > during
the rules are: preposition + noun conjuction + sentence
thus, while/conj.------ > during/prep
非常感谢
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