It is really a challenge for me to finish it. In order not to be disturbed, I spent three

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

A. locking(答案→)B. lockedC. to lockD. lock解析：考查非谓语动词。本题考查短语spend … (in) doing sth.花费……做某事，根据句意选B。

感谢回答

如以上回答内容为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！

点此我要举报以上问答信息