If you are in any doubt as to _____ you ...

If you are in any doubt as to _____ you should be doing these exercises, consult your doctor.

A．that

B．which

C．what

D．whether

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

考点分析：

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