. It is only when we cannot see clearly _____ we come to see ______ important our eyes are.

. It is only when we cannot see clearly _____ we come to see ______ important our eyes are.

1. A.
   that; what
2. B.
   which; what
3. C.
   that; how
4. D.
   which; how

. It is only when we cannot see clearly _____ we come to see ______ important our eyes are.

A. that; what             B. which; what              C. that; how                  D. which; how

It is only when we cannot see clearly _____ we come to see ______ important our eyes are．

A．that; what                                   B．which; what

C．that; how                                     D．which; how

It is only when we cannot see clearly _____ we come to see ______ important our eyes are.

A. that; what             B. which; what              C. that; how                  D. which; how