单项选择题

Our teacher recommends that we（）as attentive as possible when we visit the museum.

A、 are
B、 shall be
C、 were
D、 be

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单项选择题
Bob' leg got hurt（）the Purple Mountains.

A、 while he is climbing up
B、 when we were climbing up
C、 while we climbed up
D、 when he climbed up
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