女性，36岁，因颈部触及肿大淋巴结就诊。超声检查见肝、脾大，内见散在的低回声小结节；于腹膜后大血管旁见多发球形低回声结节，大小不等，较大者直径>4.0cm，部分结节融合，融合结节相互之间界线清晰，结节内部回声均匀。可能性大的诊断是（）

A.淋巴结炎性肿大

B.宫颈癌淋巴结转移

C.恶性淋巴瘤

D.结核性淋巴结肿大

E.胰腺囊腺癌淋巴结转移

用 must, oughtn't to, don't have to, mustn't, needn't或  have to填空。

1. You _____ go on working because you look so tired now.

2. The weather turned out to be fine yesterday. I ______ have had the trouble to carry my umbrella

    with me.

3. If you earn more than ~5,000, you _____ pay tax.

4. You ______ play now !  You shall finish your homework first!

5. You can't give up. You ______ try to get over the difficulties.