First of all, this difficult problem has to be tackled, thus______us to proceed

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问题 First of all, this difficult problem has to be tackled, thus______us to proceed to the others.

选项 A、to enable
B、enabled
C、enabling
D、having enabled

答案 C

解析 thus在此处应接现在分词表示结果，所以只能选C。

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