单项选择题

If you have really been studying English for so long, it' s about time you __ able to write letters in English.

A．should be
B．were
C．must be
D．are
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单项选择题
Indeed, almost every scientist now finds it is impossible to read all the works relevant to his own subject,______. extensively outside of it.
A．much more to read
B．much less to read
C．much less reading
D．still more reading
单项选择题
By the end of the class, some students______ green food.
A．have found
B．will be finding
C．will have found
D．are finding
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