选择题Though this has been written_ the agreement, it is not protected law

是选C的。整句话的意思是：尽管这个已被写进合同里，但它不被法律所保护。in the agreement：在合同里，be written in the agreement，写进合同里。不能说by the agreement，这样就成了：被合同写了（显然不合）。protected by

law：被法律保护。