未知题型 If the building project___________ by the end of this month is delayed, the construction company will be fined.

未知题型 Though he was born and brought up in America, he can speak ___________ Chinese.A)fluid B) smooth C) fluent D) flowing

未知题型 The fire was finally brought under control, ___________ extensive damage had been caused.A) before B) since C) after D) as