题文
"The final exam is coming. You'd better concentrate ___________ your study. " Mother informed me __________ it.
| A.to; of | B.on; off |
| C.in; on | D.on; of |
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"The final exam is coming. You'd better concentrate ___________ your study. " Mother informed me __________ it.
| A.to; of | B.on; off |
| C.in; on | D.on; of |
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