David didn"t give up _______ he had failed in the experiment four times.[ ]A
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David didn"t give up _______ he had failed in the experiment four times. |
[ ] |
A. if B. while C. though D. since |
答案
C |
举一反三
Some people won"t realize the importance of their health _______ they have lost it. |
[ ] |
A. after B. when C. until D. as |
I" ll never forget the day _________ the great scientist came to our school and gave us a speech. |
[ ] |
A. that B. which C. when D. where |
We can easily become unhappy _______ we work out our problems in our daily life. |
[ ] |
A. after B. if C. until D. unless |
—How do you like the story? —Interesting, _______ the end of it is not perfect. |
[ ] |
A. so B. though C. or D. because |
—Would you like to go for a walk with me, Allen? —I"d love to, _______ you don"t want to go alone. |
[ ] |
A. until B. before C. if D. after |
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