________ we do morning exercises every day _________ us a lot of good.?
A．If;doB．That;doC．Whether;doesD．That;does
D?
本題考查主語從句和主謂一致。that引導(dǎo)主語從句，在從句中不作成分，沒有意義，但不能省略，單個(gè)的主語從句作主語謂語動(dòng)詞通常是單數(shù)。
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