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．lockingB．lockedC．to lockD．lock
B
考查非謂語動(dòng)詞。本題考查短語spend … (in) doing sth.花費(fèi)……做某事，根據(jù)句意選B。
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