问题
选择题
—Are those your pen friends?
—Yes, _____.[ ]
A. they are
B. they're
C. they are not.
D. they aren't
答案
答案：A
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—Are those your pen friends?
—Yes, _____.[ ]
A. they are
B. they're
C. they are not.
D. they aren't
答案：A