20. According to the factory safety rules  all accidents    be reported to the safety officer.

A. may       B. can

C. would      D. shall


20.   D考查情態(tài)動(dòng)詞。句意：根據(jù)工廠的安全法規(guī)，所有的事故都必須向安全官員匯報(bào)。shall用于第二、三人稱，表示命令、警告、威脅等語氣，還可表示依照規(guī)定必須做某事。根據(jù)rules可知，這里指的是規(guī)定。故選D。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練25 情態(tài)動(dòng)詞和虛擬語氣

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