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The missing boys were last seen____ near the river.

A.     playing  B. to be playing  C. play  D. to play

The missing boys were last seen ___ near the river.

A. playing  B. to be playing  C.play   D. to play

.   The missing boys were last seen   _______   near the river.

 A. playing              B. to be playing      C. play                  D. to play

 The missing boys were last seen ______near the river.
A. playing      B. to be playing      C. play     D. to play

The missing boys were last seen near the river.

A. playing B. to be playing　　　 C. play D. to play