In order not to be disturbed, I spent three hours______in my study.

A.locking 　 B.locked 　 C.to lock 　 D.being locked

 In order not to be disturbed, I spent three hours ___ in my study.

   A. locking          B. locked         C. to lock        D. being locked

In order not to be disturbed, I spent three hours _______ in my study.

   A. locking          B. locked           C. to lock       D. to be locked

In order not to be disturbed, I spent three hours _______ in my study.

A. locking          B. locked           C. to lock          D. to be locked

In order not to be disturbed, I spent three hours _______ in my study.

A. locking              B. locked                      C. to lock                            D. to be locked