单项选择题

When Columbus______ America' s shores, he encountered copper-skinned people whom he promptly called "Indians".

A．landed
B．landed on
C．landed in
D．landed for
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单项选择题
Wang Qing did not come to the meeting; he______ the notice on the blackboard since we saw it on our way to the dining hall.
A．must not have missed
B．could not miss
C．could not have missed
D．wouldn't have missed
单项选择题
Recently, great advances have been made in the study of Venus' surface by the use of radar waves to______ the dense cloud layer.
A．persecute
B．pierce
C．penetrate
D．plunge
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