if it's because i haven't been able to
是賓語(yǔ)從句（作I wonder的賓語(yǔ)）
because i haven't been able to
是表語(yǔ)從句（作it's的表語(yǔ)）
句意：我不知道,是不是因?yàn)槲也荒茉谑彝獯荛L(zhǎng)時(shí)間,以至于我對(duì)于一切與大自然有關(guān)的事物著迷.
后面那個(gè)that強(qiáng)調(diào)句式 it's ...that...,that后面的從句是表示結(jié)果的意思