________to China before,Mr Williams didn't know how to use c

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________to China before,Mr Williams didn't know how to use chopsticks A.Never having been.B.Ha...
________to China before,Mr Williams didn't know how to use chopsticks
A.Never having been.B.Having never been
为什么?陈述句的时候不是I have never吗?

这是现在分词做非谓语动词,主动所以用having been,而表示否定时,否定词要放在非谓语词的前面

________to China before,Mr Williams didn't know how to use c I don't know __________.A.how can I use it B.how to use it C ___ several times,but he still doesn't know how to use the c I don't know how to use the machine. People didn't use to She didn't know how to make a telephone call I didn’t know how would they go to london. I didn't know how to do it问题 I ______ live alone.A、didn't use B、usedn't to C、didn't used 1,I don’t know how to use the telephone.2,How do you use the i didn't know how i could do things for myself before.从句中事态不 early man-----(eat)raw meat before they----(know)how to use