—Shall we attend the concert this evening?

    —Great idea, _______ we can do some shopping first.

A. when          B. where         C. since          D. if

 .—Shall we attend the concert this evening?   —Great idea, ___ we can do some shopping first.

A. when          B. where         C. since          D. If

—Shall we attend the concert this evening?   —Great idea, ___ we can do some shopping first.

A. when          B. where         C. since          D. if

— Shall we attend the concert this evening?

— Great idea, _____ we can do some shopping first．

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

—Shall we attend the concert this evening?   —Great idea, ___ we can do some shopping first.

A. when          B. where         C. since          D. if