________ some teenagers don’t realize is ________ difficult life can be after they get addicted to drugs.
A．What; howB．That; howC．What; what aD．That; what
A

試題分析：第一空是主語從句，what作realize的賓語，第二空是表語從句，how修飾difficult。句意：一些青少年所意識(shí)不到的是他們?nèi)旧隙景a之后生活是多么的艱難啊。
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