31.You _____return the book now. You can keep it until next week. （94广东）

31.You _C____return the book now. You can keep it until next week. （94广东）
A.. can't B. mustn't C. needn't
你没有必要现在就还书，你可以保存到下周。根据句意，应该选不需要needn't
32.You are very ill, so you ____C___ stay in bed for a week. （98广东）
A. Can B. need C. must
你病得很严重，所以你必须卧床一周。这里可以选need 也可以选must 但是后面是动词原型 而不是不定式 所以只能选must
33.I'll give the letter to her A_______ she comes back. （2000茂名）
A.. as soon as B. before C. since

她一回来我就会把信给她。as soon as一。。。就。。。

Tom was born ___C___ May 3rd, 1985.（2000广东） A.. in B. at C. on
具体日期（一天）用on

34.Can you let me __A______home a little earlier? (97广东)
A.. go B. going C. to go

let sb do sth

35.The teacher told us _A________ in the street. （96广东）
A.. not to play B. not play C. don't play

tell sb (not) to do sth

31.You c_____return the book now. You can keep it until next week. （94广东）
A.. can't B. mustn't C. needn&#