Ten minutes had been made full ____ of ____ the problem.
A．using; studyingB．use; to study
C．to use; to studyD．use; studying
B

試題分析：句意：十分鐘的時間正在被充分利用來研究這個問題。make full use of 充分利用，用的是被動語態(tài)，目的是為了研究這個問題，to表示了為了什么目的
選B。
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