Your understanding on the theory is satisfactory. You must read more after class.
A. far from
B. up to
C. along with
D. free of
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(答案→)A. far from
B. up to
C. along with
D. free of
解析: far from“远非,完全不”; up to “忙于,相当于”; along with “同……一起”; free of “无……,摆脱……”;句意:你对于理论的理解还不令人满意,你还需课下再多读。故选A