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We left Xi' an _.___ a very hot summer afternoon.

A. on                    B.in                C. during        D.by

We left Xi' an _.___ a very hot summer afternoon.

A. on                    B.in                C. during        D.by

We left Xi' an _.___ a very hot summer afternoon.

A. on                    B.in                C. during        D.by

We left Xi' an _.___ a very hot summer afternoon.

A. on                    B.in                C. during        D.by

We left Xi' an _.___ a very hot summer afternoon.

A. on                    B.in                C. during        D.by