In time of serious accidents _____ we know some basic things about first aid, we
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| In time of serious accidents _____ we know some basic things about first aid, we can save lives. |
A. whether
B. until
C. if
D. unless |
答案
举一反三
| The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again. |
A. after
B. before
C. since
D. when |
— Our holiday cost a lot of money.
— Did it? Well, that doesn"t matter _____ you enjoyed yourselves. |
A. as long as
B. unless
C. as soon as
D. though |
— 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 |
| Leave your key with a neighbor _____ you lock yourself out one day. |
A. ever since
B. even if
C. soon after
D. in case |
| Having checked the doors were closed, and _____ all the lights were off, the boy opened the door to his bedroom. |
A. why
B. that
C. when
D. where |
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