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 See the flags on top of that building? That was ________ we did this morning.

A. when                         B. which                      C. where                      D. what

See the flags on top of the building? That was _______ we did this morning.

A. when      B. which       C. where         D. what

see the flags on top of the building? that was____ we did this morning.

A.when                   B.which                  C.where                    D.what

See the flags on top of the building? That was          we did this morning.

A. when              B. which                C. where               D. what

See the flags on top of the building? That was _______ we did this morning.

A. when                 B. which                 C. where                   D. What

See the flags on top of the building?That was___we did this morning.

A.when          B.which         C.where         D.what

See the flags on top of the building ? That was           we did this morning.

       A．when                  B．which                 C．where                 D．what

See the flags on top of the building?That was__________we did this morning.

A.when　　　 B.which　　　　　 C.where　　　　　 D.what ?