[单选题] ________ such heavy pollution already, it may now be too late to clean up the river.

1、[单选题]You were silly not ________ your car.

• A、to lock
• B、to have locked
• C、locking
• D、having locked

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2、[单选题]The managers discussed the plan that they would like to see ________ the next year.

• A、carried out
• B、carrying out
• C、carry out
• D、to carry out

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3、[单选题]Helen had to shout ________ above the sound of the music.

• A、making herself hear
• B、to make herself hear
• C、making herself heard
• D、to make herself heard

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4、[单选题]________ such heavy pollution already, it may now be too late to clean up the river.

• A、Having suffered
• B、Suffering
• C、To suffer
• D、Suffered

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5、[单选题]Reading is an experience quite different from watching TV; there are pictures ________ in your mind instead of before your eyes.

• A、to form
• B、form
• C、forming
• D、having formed

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