We should well balance our work and relaxation, and only by doing that, as everybody would agree , a good state of mind.
A. can we have
B. we can have
C. need we have
D. we need have
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(答案→)A. can we have
B. we can have
C. need we have
D. we need have
解析：考查倒装句式。as everybody would agree是插入语，可以忽略，only位于句首，修饰介词短语、副词、时间状语时，用部分倒装，排除B、D；can能，可以；need需要；这里表示“可以”的含义。故选A。