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________ 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．Having failed

C．To fail

D．Failed