Order came that all the army supply ______ to the front before daybreak.

A．be sent

B．should send

C．were sent

D．should have sent

诊断支原体肺炎的主要依据是（）

A.红霉素试验性治疗

B.痰细菌培养阴性

C.血清冷凝集试验阳性

D.临床表现

E.X线特异表现