The pressure _____ causes Americans to be energetic, but it also puts them under a constant emotional strains. <br>A) to compete B) competing C) to be competed D) having competed <br>

The pressure _____ causes Americans to be energetic, but it also puts them under a constant emotional strains.
A) to compete B) competing C) to be competed D) having competed

出自：东北农业大学大学英语Ⅲ

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