Leave your key with a neighbor ___ you lock yourself out one day
As
B. Since
C. If
D. While
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---Where’s that report?---I brought it to you ____you were in Mr. Black’s office yesterday.
A. if
B. when
C. because
D. before
All people,______they are old or young, rich or poor, have been trying their best to help those in need since the disaster.
A. even if
B. whether
C. no matter
D. however
-----Have you got any particular plans for the coming holiday?----- Yes, _______, I’m going to visit some homes for the old in the city.
A. If ever
B. If busy
C. If anything
D. If possible
中央处理器是指( )
A. 运算器
B. 控制器
C. 运算器、控制器、cache
D. 运算器、控制器、主在