　　 old man behind Luke is 　　 university teacher. A. An; an B. A; the C. The; a D. The; an

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started; had already hidden was starting; hid had started; had already hidden had started; was hiding

kicks　 kicked 　 is kicked 　 was kicked

kicks kicked is kicked was kicked

An; an A; the The; a The; an

started; had already hidden had started; had already hidden had started; was hiding was starting; hid

the oldest an oldest one the old an old one

B.C.D.四个选项中，选出一个可以填入空白处的最佳选项。 _________ old man behind Tom is _________ university teacher. A. An; an A; the The; a The; an

which that / who

killing the old man kill the old man the old man to be killed the old man being killeD.

started ;had already hidden had started ;had already hidden had started ;was hiding was starting; hid

sixtieth percent; is; An; an sixty percents; are; A; the two third; is; The; an two thirds; are; The; a

against, could over, would beyond, should behind, must

Started; had already hidden had started; had already hidden had started; was hiding was starting; hid