Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
#80316
A
since
B
before
C
after
D
when
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I couldn’t help feeling great I put on the parachute and was pulled off the beach.
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even though
B
whether
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while
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there
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in which
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when
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because
B
even if
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if
D
so that