In the past few years，My Heart Will Go On was a popular song among young people, _______were often heard singing it at parties.

A．who

B．which

C．they

D．that

常规对女性不孕症有关卵巢功能的检查中，下列哪项是不必要的（）

A.宫颈黏液涂片检查

B. * * 细胞学检查

C.基础体温测定

D.经前诊刮或子宫内膜活检

E.腹腔镜检查