问题

In order not to be disturbed, I spent three days _____ in my study [ ]

A: locking
B: locked
C: to lock
D: lock

正确答案是：

同类题型

has made great progress recently—_____, and______

––– I promise my daughter ____ get a nice present on her birthday. ––– I think it will be a big surprise to her.

Through thorough investigof polluted water.

Shall we go to the art exhibition rightaway— _____

I have an apple, Uncle Pal— ________. An apple a day keeps the doctor away.