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251. The America’s selling weapons to Taiwan cast a shadow on the Sino-U.S relationship. Which of the following can explain the underlined part?

251. The America’s selling weapons to Taiwan cast a shadow on the Sino-U.S relationship. Which of the following can explain the underlined part?

A.was a good omen on   B. had ill effect on    C. was at war with               D. Effected

The America’s selling weapons to Taiwan cast a shadow on the Sino-U.S relationship. Which of the following can explain the underlined part?

A. was a good omen on B. had ill effect on　　 C. was at war with　 D. effected