题目列表(包括答案和解析)
| A．in | B．on | C．at | D．of |
Listen! Some girls ________ songs in the classroom.
A. singing B. sing C. are singing
Listen! Some birds are singing __________ the tree.
A. in B. on C. at D. of
Listen! Some birds are singing __ the tree!
A. in B. on C. at D. of
Listen! Some birds are singing __________ the tree.
A. in B. on C. at D. of
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