Along with his letter was his promise ________ he would visit me this coming week．
A.whichB.thatC.whatD.whether在线课程B
四个选项中只有连词that能引导同位语从句但在句中不担任成分，该同位语从句所修饰的先行词为promise，答案为B.例如:
We heard the news that her daughter had left home．
我们听说她女儿离家出走的消息了.
The fact that his health is falling is not true．
他健康状况不佳的情况不是真的.
Where did you get the idea that I could not come?
你在哪儿听说我不能来的?