If you are in any doubt as to _____ you should be doing these exercises, consult your doctor.
A．thatB．whichC．whatD．whether
D

試題分析：考查賓語從句。Whether引導(dǎo)賓語從句whether you should be doing these exercises;句意：對(duì)于你是否應(yīng)該做這些實(shí)驗(yàn)，如果你有任何疑問，請(qǐng)咨詢你的醫(yī)生。故D正確。
點(diǎn)評(píng)：對(duì)賓語從句的考查主要集中在語序和考查和連接詞的詞義辨析上。
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