He will take up ones if he has a lot of different tasks to choose from.
A. tough
B. tense
C. bad
D. instant
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(答案→)A. tough
B. tense
C. bad
D. instant
解析:考查形容词辨析。句意“如果他有很多困难的任务要选择的话,他将选一些艰难的来做。”tough“困难的,棘手的”;tense“紧张的”;bad“坏的,糟糕的”;instant“立即的”。故选A。