His promise ___ he would marry her when he came back turned out to be a lie, ___ left the girl heart-broken.
A.which; what
B.that; which
C.what; which
D.which ; that
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B解析考查同位语从句和定语从句。that he would marry her when he came back这个同位语从句解释his promise；第一空which指代前面这件事，在定语从句中做主语。句意：他说的他回来时就娶她的诺言结果证明是一个谎言，这件事情让她心都碎了。