You can’t imagine _________ when they received these nice Christmas presents．
A.how they were excitedB.how excited they wereC.how excited were theyD.they were how excited在线课程B
解析：
本题考查由感叹句变来的宾语从句。此时，位于从句句首的应为连接词how，形容词或副词紧随其后，然后是正常的陈述句语序。根据这一要求，本题应该选择B。