CCTV is exactly like a window on the world_________ you sit by it and fix your attention on what it shows.

1. A.
   if
2. B.
   as if
3. C.
   even if
4. D.
   if any

CCTV is exactly like a window on the world_________ you sit by it and fix your attention on what it shows.

A．if　　　　　　　 B．as if　　　 　C．even if　　　　D．if any

CCTV is exactly like a window on the world __________ you sit by it and fix your attention on what it shows.

A. if　　　　     B. as if　　　　　　　　  C. even if　　　　 　　  D. if any

A. if　　　　     B. as if　　　　　　　　  C. even if　　　　 　　  D. if any

CCTV is exactly like a window on the world ________ you will sit by it and fix your attention on what it shows.

1. A.
   if
2. B.
   as
3. C.
   while
4. D.
   unless