Question

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

Answer 1

B

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。