If you are in any doubt as to _____ you should be doing these exercises, consult your doctor.A.thatB.whichC.whatD.whether
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D解析试题分析：考查宾语从句。Whether引导宾语从句whether you should be doing these exercises;句意：对于你是否应该做这些实验，如果你有任何疑问，请咨询你的医生。故D正确。考点：考查宾语从句点评：对宾语从句的考查主要集中在语序和考查和连接词的词义辨析上。