当他打开门时,他发现他的钥匙哪都找不到英文

1 if a book is in english,( )means slow progress for you A as B which C what D that 2 there are about seven million people taking part in the election, ( )are well educated a most of whom b most of them c most of who d most of that 3 when he ( )the door ,he found his keys were nowhere. a would open b opened c had opened d was to open 这题的答案是D,那为什么不选B呢? 4 every evening after dinner,if not( )from work ,i will spend some time walking my dog. a being tired b tiring c tired d to be tired 这题的答案是C,那为什么不选A