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 ________to reach them on the phone, we sent an email instead.

A. Fail             B. Having failed           C. To fail       D. Failed

       to reach them on the phone, we sent an email instead

 A. Fail  B. Failed  C. To fail  D. Having failed

_________to reach them on the phone, we sent an email instead.

A. Fail            B. Failed             C. To fail          D. Having failed

_______to reach them on the phone, we sent an email instead.

A. Fail            B. Failed             C. To fail          D. Having failed

_________to reach them on the phone, we sent an email instead.

A. Fail            B. Failed             C. To fail          D. Having failed