Question

Nobody told us _____

1. A.
   what to do it
2. B.
   how to do
3. C.
   where to do
4. D.
   when to do it

Answer 1

D
考查疑問詞+不定式的用法。What作do的賓語，it多余，排除A；B、C兩項缺少賓語；D項不缺賓語。句意“沒有人告訴我們什么時候做這件事。”故選D。