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He is very old, ______ he still works very hard.

A. but       B. if          C. when      D. as

He is very old,____ he still works very hard.     

A. but               B.if            C.when             D.as

He is very old,____ he still works very hard.     

A. but               B.if            C.when             D.as

He is very old,____ he still works very hard.     

A. but               B.if            C.when             D.as

He is very old,____ he still works very hard.     

A. but               B.if            C.when             D.as