(单选题)
The research he devotes himself to ______ the farmers have a better harvest is very important.
A.help
B.helps
C.helping
D.helped
参考答案：C
参考解析：
考查动名词作宾语。句意：他致力于帮助农民们有更好的收成的研究非常重要。此处考查devote oneself to doing sth，意为“投身于……”，且句中he devotes himself to______ the farmers have a better harvest作定语修饰research。故选C。
知识点：
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