题文
You can’t be ______ when you camp _____ an high altitude, where the air is thin.
| A．enough careful; at | B．too careful; at | C．careful enough; on | D．too careful; on |
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You can’t be ______ when you camp _____ an high altitude, where the air is thin.
| A．enough careful; at | B．too careful; at | C．careful enough; on | D．too careful; on |
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