I think _______ our duty to keep our environment clean and tidy.
A．thisB．thatC．itD．one
C

試題分析：it�？梢杂米餍问劫e語(yǔ)或者形式主語(yǔ)，當(dāng)think后面的賓語(yǔ)從句內(nèi)容較長(zhǎng)時(shí)，常常用it代替后面從句內(nèi)容，做形式賓語(yǔ)，其它選項(xiàng)沒(méi)有這個(gè)功能，故選C。
點(diǎn)評(píng)：it有兩種用法，一種是做形式主語(yǔ)，另一種就是形式賓語(yǔ)。在這里it 做了think的賓語(yǔ)，賓語(yǔ)后面be動(dòng)詞可以省略。
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