答案：D
用排除法比较简单.
A是第三人称单数,与主语I不符,排除.
B是过去时,I didn't think如果是过去时,那think的宾语从句they are anxious...也应该是过去时,排除.
C项haven't后要加thought,排除.
句意：我本来会去看他们的,但我认为他们不想见到我.（but前是虚拟,后面是陈述）