单项选择题

Every possible means（）tried, but we can not open the door.

A、 are
B、 are being
C、 were
D、 has been

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He was very tired and could hardly stand up, let alone（）

A、 to walk
B、 walk
C、 walking
D、 walked fast
单项选择题
The police（）searching for a missing child everywhere when he suddenly appeared at home .

A、 was
B、 were
C、 is
D、 are
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