Question

I don’t know         . When he         . I will phone you.

1. A.
   when will be some back, comes back
2. B.
   when is he coming back, will come back
3. C.
   when he comes back, is coming back
4. D.
   when he is coming back, comes back

Answer 1

D
此題重點考查when引導賓語從句和時間狀語從句的不同。前者要用陳述句語序，且時態(tài)要和主句保持一致；后者常用一般現(xiàn)在時。