The infrastructure of a country is 　　　　 makes everything run smoothly， including things like transport， irrigation， electricity， postal service， telephones and schools.
A．thatB．whatC．whichD．a(chǎn)s
B
考查名詞性從句。句中what引導(dǎo)表語從句，在從句中作主語，故選B。
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