He bought me a book, _____ was very useful.
举一反三
- He bought me a book, _____ was very useful. A: who B: that C: which D: what
- The book ___ he bought yesterday is very interesting.
- The book ________ he bought yesterday is very interesting.A. / B. why C. when D. what
- Is this the book ____________ (what, /) he bought last week?
- The shirt（）was very expensive. A: bought last week B: he bought week C: which he bought it last week D: he bought last week