The manager was concerned to hear that two of his trusted workers  ________.[ ]

A. will leave  

B. are leaving

C. have left  

D. were leaving

消化道重复症可能出现的并发症有（）

A.消化道出血

B.慢性腹泻

C.肠穿孔

D.肠梗阻

E.肠套叠