问题
选择题
Carl Linnaeus made great contributions to ________ plant species.
A．group
B．have grouped
C．grouping
D．been grouping
答案
答案：C
make great contributions to 短语中to为介词，所以答案C。
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Carl Linnaeus made great contributions to ________ plant species.
A．group
B．have grouped
C．grouping
D．been grouping
答案：C
make great contributions to 短语中to为介词，所以答案C。