It is really a challenge for me to finish it. In order not to be disturbed, I spent three days ______ in my study surfing the internet to do the research.
A.locking | B.locked | C.to lock | D.lock |
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It is really a challenge for me to finish it. In order not to be disturbed, I spent three days ______ in my study surfing the internet to do the research.
A.locking | B.locked | C.to lock | D.lock |