Helenlistenedcarefully_________shemightdiscoverexactlywhatJohnwanted.
A.so as thatB.in order thatC.in order toD.so as to在线课程B
解析：
so as that没有这种用法in order that为了，后面接从句in order to 为了接名词或动名词， so as to以至接名词或动名词，根据题意选B，为了能准确的发现约翰想要的，海伦听得非常认真。