单项选择题

Linda feels exhausted because she______so many visitors today.

A．has been having
B．had been having
C．was having
D．had had
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单项选择题
By the end of this month, we surely ______ a satisfactory solution to the problem.
A．will be finding
B．will have found
C．are finding
D．have found
单项选择题
The grain output of this year is much higher than ______ of last year.
A．that
B．such
C．which
D．what
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