We should do what we have to do we can do what we want to do in the future.
A. so that
B. in case
C. for fear that
D. now that
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(答案→)A. so that
B. in case
C. for fear that
D. now that
解析：句意：我们应该做我们必须做的,这样我们可以做我们将来想做。so that 以便，所以；in case 万一；for fear that 以防万一；now that既然，由于；现在做的会对将来做的有影响，前后因果关系，故选A。