______ are the birds doing?—They are singing in the tree.
A: Who
B: What
C: How
D: Where
A: Who
B: What
C: How
D: Where
举一反三
- ______ are the birds doing? They are singing in a tree.
- ____ birds are there in the tree? A: How much B: What C: How many D: Where
- _____are the birds doing? They are singing. A: Who B: What C: How
- The birds are singing ____________ the tree. A: on B: in C: of D: with
- 中国大学MOOC: The birds are singing ____________ the tree.