1.Fibers of hair and wool are not continuous and must normally be spun into thread
网友回答
1、when to be 这是非常简洁的用法.
2、he would be staying 他听见别人说时,应当是You will be staying,转述时,自然变成would.
3、didn't ...would win 问句虽然是用现在时态,但回答时用的是昨晚的想法.用don't 本无不可,但后面用has won显然不通.
4、is to be 这里用的被动式,相当于“如果要避免食物短缺”,to be 的意思是比较强烈的.其他三个都不合适.在if后面,will be和has been的时态不对,can be的意思不当.
======以下答案可供参考======
供参考答案1:
第二题选第二个，第三题选第二个。其他不确定
供参考答案2:
1when to be 2 he would be staying 3don't... has won 4 is to be
供参考答案3:
1.if they are to be
2.he would be staying
根据heard，后面从句应该相应用过去时态，所以用将来过去时
3.didn't ... would win
虚拟句我真的没有想到Jackson会赢
4.is to be/