It is well-known ______ a person, especially the old, eats too much he’ll feel uncomfortable.
A．thatB．when ifC．ifD．that when
D
考查：it做形式主語(yǔ)，真正地主語(yǔ)是后面的that 從句，that 從句中又是一個(gè)由when引導(dǎo)的時(shí)間狀語(yǔ)從句。句意：眾所周知。當(dāng)一個(gè)人，尤其是老人，吃太多的時(shí)候他會(huì)感到不舒服的。故選D。
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