A high-tech exhibition ________in the National Museum now. Let’s go and visit it.

A．will be held

B．is being held

C．was held

D．has been held

粘膜下子宫肌瘤最常见的症状是

A．下腹包块
B．痛经
C．月经过多，经期延长
D．白带过多
E．不育