All of a sudden it ____ Coke that there might be some policemen waiting for him in the house.

A．occurred

B．happened

C．stuck

D．hit

患儿男，3岁。生后多次患肺炎，体检颈部、腹股沟可触及数个单个、质软、黄豆大小淋巴结，末梢血淋巴细胞1×10/L。下一步应做哪项检查()

A．血清免疫球蛋白测定

B．骨髓涂片

C．同族血型凝集素测定

D．淋巴结活检

E．细胞免疫功能检查