单项选择题

I don't doubt ______ he will come on time.

A．whether
B．which
C．what
D．that
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单项选择题
One reason for the successes of Asian immigrants in the U.S. is that they have taken great ______ to educate their children.
A．pains
B．endeavors
C．efforts
D．attempts
单项选择题
Indeed, almost every scientist now finds it 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
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