单项选择题

All I can say about them（）that they are the most competent engineers I have ever seen.

A．have
B．has
C．are
D．is

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单项选择题
（）the sun rising above the surface of the sea, we couldn't help letting out a shout of joy.

A．Seeing
B．See
C．To see
D．Having been seen
单项选择题
-- I usually go there by bus.-- Why not（）by train for a change

A．to try going
B．to try to go
C．try going
D．trying to go
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