---Do you think the thief entered through the window?
---No, if he had, I don’t believe, _______ broken the living-room’s window

1. A.
   he would have
2. B.
   he must have
3. C.
   he had
4. D.
   should he have

—Do you think the thief entered through the window?

—No, if he had, I don’t believe, _______ broken the living-room’s window.

A. he would have            B. he must have

C. he had                   D. should he have

—Do you think the thief entered through the back door?
—No, if he had, I don’t believe he ______ the living-room window.

—Do you think the thief entered through the back door?

—No, if he had, I don’t believe he ______ the living-room window.

A．would break       B．broke            C．would have broken  D．had broken

—Do you think the thief entered through the back door?
—No, if he had, I don’t believe he ______ the living-room window.

1. A.
   would break
2. B.
   broke
3. C.
   would have broken
4. D.
   had broken