单项选择题

Mary was (surprised to) realize that it was (us), her old (school friends), (calling) her from Paris.（）

A．surprised to
B．us
C．school friends
D．calling

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单项选择题
(If) the experiment succeeds or fails, it will (provide us) with valuable (experience) which is essential to (improving) our future work.（）

A．If
B．provide us
C．experience
D．improving
单项选择题
Your experiment reports must be checked with care before （）

A．handed them in
B．them handing in
C．being handed in
D．handing them in
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