[单选题] Victor apologized for ________ to inform me of the change in the plan.

1、[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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2、[单选题]The old man, ________ abroad for twenty years, is on the way back to his motherland.

• A、to work
• B、working
• C、to have worked
• D、having worked

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3、[单选题]Robert is said ________ abroad, but I don’t know what country he studied in.

• A、to have studied
• B、to study
• C、to be studying
• D、to have been studying

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4、[单选题]________ the programme, they have to stay there for another two weeks.

• A、Not pleting
• B、Not pleted
• C、Not having pleted
• D、Having not pleted

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5、[单选题]The research is so designed that once ________ nothing can be done to change it.

• A、begins
• B、having begun
• C、beginning
• D、begun

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