科目: 来源: 题型:选择题
| A. | began,listened | B. | was begun,was listening | ||
| C. | had begun,listened | D. | had begun,were listening |
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科目: 来源: 题型:选择题
| A. | to have been infected | B. | to be infected | ||
| C. | to having been infected | D. | to have infected |
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科目: 来源: 题型:选择题
| A. | for | B. | to | C. | in | D. | with |
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科目: 来源: 题型:选择题
| A. | as | B. | when | C. | while | D. | and |
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科目: 来源: 题型:选择题
| A. | however | B. | whichever | C. | whenever | D. | wherever |
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科目: 来源: 题型:选择题
| A. | Since | B. | Until | C. | From | D. | By |
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科目: 来源: 题型:选择题
| A. | until | B. | before | C. | when | D. | unless |
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科目: 来源: 题型:选择题
| A. | even if | B. | as if | C. | even though | D. | in case |
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科目: 来源: 题型:选择题
| A. | while | B. | since | C. | before | D. | unless |
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