单项选择题

______ do you change the cell for your watch ( )

A．How many
B．How often
C．How little
D．How soon
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单项选择题
The book is ______ to be put into that envelope. You need a bigger one. (
A．big enough
B．too big
C．very big
D．so big
单项选择题
--Nice to see you. I ______ you for a long time.--I ______ in Berlin. I've just got back.
A．didn't see, am
B．wasn't seeing, am
C．hadn't see, have been
D．haven't seen, was
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