单项选择题

—What do you think made Mary so upset —her new bicycle.

A．As she lost
B．Lost
C．Losing
D．Because of losing
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单项选择题
The letter they looked forward to______ at last.
A．arrive
B．arrived.
C．arriving
D．had arrived
单项选择题
Only when your identity has been checked,______.
A．you are allowed in
B．you will be allowed in
C．will you allow in
D．will you be allowed in
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