【題目】- The air pollution is terrible.
- It will be worse ________ we take action to protect the environment.
A.if
B.unless
C.until
D.when

【答案】B
【解析】句意:——空氣污染很可怕。——除非我們采取行動來保護環(huán)境,否則會變得更糟。if表示如果; unless表示除非; until表示直到…才; when表示當(dāng)…時候.根據(jù)語境和句意除非我們采取行動來保護環(huán)境.故選B。

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