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

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

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问题 If you are in any doubt as to______you should be doing these exercises, consult your doctor.
选项 A、that
B、if
C、whatever
D、whether
答案D
解析 本题考查宾语从句的引导词。句意为“如果你对于是否应该做这些运动有任何疑惑，(请)咨询你的医生”。whether和if都有“是否”的意思，但介词后面只能使用whether。故本题选D。
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