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【单选题】
某项工作，甲单独做需10天完成，乙单独做需6天完成。如果甲先做2天，然后乙接替甲做2天，再由甲接替乙做2天……两人如此交替工作。那么，完成此项工作共用多少天?A.
6
B.
7
C.
8
D.
9
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反馈参考答案：
举一反三
【单选题】Actually, _____ works hard can be _____ he wants to be, whether it is a pilot, an engineer or a
A.
33. Actually, _____ works hard can be _____ he wants to be, whether it is a pilot, an engineer or a manager. A．anyone; whoever
B.
whoever; whatever
C.
who; no matter what
D.
no matter who; whomever
【单选题】Actually, _____ works hard can be _____ they want to be, whether it is a pilot, an engineer or a manager. [ ]
A.
anyone; whoever
B.
no matter who; whoever
C.
whoever; no matter what
D.
whoever; whatever
【单选题】Although Mike worked ______ , he could ______ support his family.
A.
hard, hard
B.
hard, hardly
C.
hardly, hard
D.
hardly, hardly
【单选题】It was _____ problem that _____ of the students could work it out [ ]
A.
so hard a; a few
B.
so hard a; few
C.
such hard a; few
D.
such a hard; a few
【简答题】A．You should go to your friends' house more often. B．You should refuse to go to your colleagues' homes. C．You should try to make friends with other people. D．You should work harder.
【单选题】It snowed so _____ yesterday that people could ______ walk outside.
A.
hard; hardly
B.
hardly; hard
C.
hard; hard
D.
hardly; hardly
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