动词不定式专项练习
1. this company was the first ___ portable radios as well as cassette tape recorders in the world.
a. producing b. to produce c. having produced d. produced
2. 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
3. the news reporters hurried to the airport, only ______the film stars had left.
a .to tell b .to be told c .telling d .told
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