选A.首先,B和C排除.原因吗,how没有这样用的.what也是.why也是.D排除.A耍了一个花招,在宾语从句中省略了that.再举个例子: We know(that)sound can travel through air.但是,在介词后的宾语从句中that常不可省略，且前面往往有个形式宾主it.如:You may depend on it that they will support your plan. See to it that you are not late again. Except that he speaks too fast, he is an excellent teacher.还有,两个宾语从句连用时，即...
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