Question

(2013·青島一模)All flights ________ owing to the heavy fog, many passengers could do nothing but take trains.

A．to be cancelled	B．were cancelled
C．have been cancelled	D．having been cancelled

Answer 1

D

選D　考查獨(dú)立主格結(jié)構(gòu)。逗號(hào)前后兩部分之間沒(méi)有連詞，因而前半部分不可能是句子，排除B、C兩項(xiàng)。此處只能用獨(dú)立主格結(jié)構(gòu)，動(dòng)詞不定式在此結(jié)構(gòu)中表示將來(lái)，故排除A項(xiàng)�，F(xiàn)在分詞的完成被動(dòng)式表示被動(dòng)、完成，故選D項(xiàng)。