来自冯春华的问题
()Ifrommybrotherforalongtime.A.nothaveheardB.havenotheardC.haveheardnot
()Ifrommybrotherforalongtime.A.nothaveheardB.havenotheardC.haveheardnot


()Ifrommybrotherforalongtime.A.nothaveheardB.havenotheardC.haveheardnot
()Ifrommybrotherforalongtime.A.nothaveheardB.havenotheardC.haveheardnot
B.havenotheard
用完成时态,因为后面是foralongtime