摘要： a/an/the A. There's "u" and "s" in word "us". B. There is young man and old man in the photo. old man is young man's father.
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There is ______ "s" in the word "swim" and it is ______ first letter in it.
[ ]
A. an...the B. a...the C. an...a D. /...the
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单项选择：
There is ______ iron ball on ______ shelf.
[ ]
A. a... the B. an... the C. an... / D. the... a
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We had _______ 8-day holiday during this National holidays, but some of us felt unhappy because of _________heavy traffic on the highways.
| A．an, the | B．a, the | C．a, a | D．an, a |