Mrs. Black doesn’t know if her American friend____ to HeiLongjiang．If he ____ here, she will meet him at the airport．

A．will come , comes                    B．will come , will come

C．comes, will come                      D．comes, comes

Mrs. Black doesn’t know if her American friend                   to Heilongjiang．If he              here，she will meet him at the airport．

A．will come；come                  B．will come；will come             C．comes；will come