问题描述：
●●●●●一道英语选择题17●●●●●18
The teacher told us to hand in the _____ on time.
A.exercise paper B.exercises papers
C.exercise papers D.pieces of exercise paper
这道题应该选什么?为什么?谁能帮我解释一下!
The teacher told us to hand in the _____ on time.
A.exercise paper B.exercises papers
C.exercise papers D.pieces of exercise paper
这道题应该选什么?为什么?谁能帮我解释一下!
问题解答：
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