This book will show you______can be used in other contexts.A.how you have observed at you have observedC.how what you have observedD.how that you have obseved為什么要選C，A怎么不對了？？？

熱心網友

要是A的話，那么充當how引導的從句里面就少了賓語應該是sth (you have observed) can be used，而不是you have observed can be used

熱心網友

用A的話，應改為 ....how sth you have observed can....用語法解釋實在很枯燥，建議多讀課文，加強語感，就能輕松解決