问题补充：
--- Excuse me, can I have a talk with Mr. Miller this afternoon?
---A moment, please. Let me check.
A. if Mr. Miller will be free
B. when will Mr. Miller have time
C. if Mr. Miller had a meeting
D. when does Mr. Miller come back
答案：
(答案→)A. if Mr. Miller will be free
B. when will Mr. Miller have time
C. if Mr. Miller had a meeting
D. when does Mr. Miller come back
解析：句意：--请问，今天下午我可以和Miller先生谈一谈吗？--请稍等，让我查查是否Miller先生有空。这里是if引导的宾语从句，宾语从句的语序是陈述语序，故排除BD；根据上文可知这里指Miller先生今天下午是否有空，是将来时，故排除C。故选A。
