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29. The field research will take Joan and Paul about five months; it will be a long time ______ we meet them again.

A. after          B. before          C. since            D. when

The field research will take Joan and Paul about five months; it will be a long

time ____ we meet them again.

   A. after      B. before      C. since      D. when

The field research will take Joan and Paul about five months; it will be a long time __________ we meet them again.

A. after   B. before   C. since  D. when

The field research will take Joan and Paul about five months; it will be a long time _______ we meet them again.

A.after    B.before    C.since     D.when

The field research will take Joan and Paul about five months;it will be a long time_____we meet them again.

A.after                                                            B.before

C.since                                                            D.when

The field research will take Joan and Paul about five months;it will be a long time_____we meet them again.

A.after                  B.before   C.since                     D.when

The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.

     A. after             B. before             C. since                  D. when

The field research will take Joan and Paul about five months; it will be a long time _________ we meet them again.

A. after             B. before             C. since                D. when

The field research will take Joan and Paul about five months; it will be a long time ________ we meet them again.

 A. after           B. before               C. since                D. when

The field research will take Joan and Paul about five months;it will be a long time_____we meet them again.