The first use of atomic weapons was in 1945, and their power __________ increased enormously eversince.
| A．is |
| B．was |
| C．has been |
| D．had been |
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The first use of atomic weapons was in 1945, and their power __________ increased enormously eversince.
| A．is |
| B．was |
| C．has been |
| D．had been |
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