It is well known to us all that a lot of rivers _______by factories.
A．a(chǎn)re pollutingB．have been polluting
C．a(chǎn)re being pollutingD．a(chǎn)re being polluted
D
考查時(shí)態(tài)語(yǔ)態(tài)，river和pollute是被動(dòng)關(guān)系，但四個(gè)選項(xiàng)只有D項(xiàng)是現(xiàn)在進(jìn)行時(shí)的被動(dòng)，句意是：眾所周知的是很多河流正在被工廠污染。選D。
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