______ some teenagers don’t realize is _______ difficult life can be after they get addicted to drugs．
A．What, howB．That, howC．What, what a D．That, what
A
考查名詞性從句。第一空是主語從句，從句中缺少賓語所以用關(guān)系what，第二空是表語從句，此句是一個感嘆句，空后面的詞是形容詞difficult所以用how修飾，故選A。
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