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问题: choose the best answer

with so many problems to deal with,they ____another difficult year.
A are having B are to have C are going to have
D have
which one is right ? how to tell these two phrases between "be to do sth "and "be going to do sth"

解答:

   be to 表示客观安排或受人指示而做某事。
   be going to 表示主观的打算或计划。
 I am to play football tomorrow afternoon.   (客观安排)
 I'm going to play football tomorrow afternoon. (主观安排