—Computer is so useful. It can do almost everything.
—Yes, but it ______ what to do.

—Computer is so useful. It can do almost everything.

—Yes, but it ______ what to do.

A．will tell

B．has known

C．must be told

D．is told

—Computer is so useful. It can do almost everything.
—Yes, but it ______ what to do.

1. A.
   will tell
2. B.
   has known
3. C.
   must be told
4. D.
   is told

—Computer is so useful. It can do almost everything.

—Yes, but it ______ what to do.

A. will tell 　B. has known C. must be told D. is told