单项选择题

(It) is often easier (to select) a particular tool (than to use) (them) correctly.

A．It
B．to select
C．than to use
D．them
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单项选择题
His (remark) (made) me (confusing); however, I (understood) later on.
A．remark
B．made
C．confusing
D．understood
单项选择题
(No matter how) hard he is working, he will (insist) (on) the principle as (hardly) as he can.
A．No matter how
B．insist
C．on
D．hardly
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