21. The message has been clearly conveyed in Xi Jinping’s speech ________ the modernization of Chinese navy is to be sped up.
A. whether B. that C. why D. which
22. ________ too early to the foreign language study, according to some experts, may lead to some unfavorable outcomes.
A. Exposing B. Having exposed C. Being exposed D. Exposed
23. The allies（盟友）of America, France and Britain launched airstrikes on several targets in Syria, which Putin, President of Russia, ________ as an act of aggression.
A. condemned B. confirmed C. countered D. contradicted
