---Excuse me, could you tell me ________?---Certainly. Go straight ahead and you'll see it on your left.A.where the post office isB.when you will visit the museumC.where is the post officeD.when will you visit the museum
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A解析考查宾语从句。由于宾语从句是主谓结构，先排除C、D项，本句也是问路的功能句，应该是一般现在时态。故选A。