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【单选题】

While we _________, we saw a UFO land on a street.

A.
were shopping
B.
shopped
C.
are shopping
D.
shop
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参考答案:
参考解析:
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举一反三

【单选题】Tom was _____ the queue when I saw him. [ ]

A.
at the head of
B.
at head of
C.
on the head of
D.
around