1.Treacherous weather conditions _____ forced the closure of many airports in the east coast. (A) has (B) have (C) are being (D) has been 主詞conditions是複數。
2.Many financial firms and banks in Korea have been hit by exposure _____ problems in the US housing market. (A) from (B) with (C) to (D) in exposure to xxx:置身於xxx的狀況之下
3. Cigarette sales in France _____ drastically since the introduction of the country’s ban on smoking in all public places. (A) has been dropping (B) has dropped (C) have dropped (D) dropped 主詞sales是複數。用[現在完成式]動詞,表示目前是這個結果。
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