We will do it ourselves asking others to help.A. instead ofB. insteadC. butD. however

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(答案→)A. instead of
B. instead
C. but
D. however
解析：考查连接词。句意：我们将自己做这件事，而不会向他人求助。instead of代替，后跟名词、代词、动名词；instead是副词，不能加动名词；but是并列连接词，however是副词，作状语。故选A。