________ research has been done into this difficult and complicated case, so we believe someday we can solve it.
举一反三
- He has made _____ great progress_____ we can hardly believe it.
- It is ______ problem that few people can solve it. A: such difficult a B: such difficult C: so difficult a D: so difficult
- It is ______ difficult a math problem ______ no one can solve it. A: so; that B: such; that C: so; but D: such; but
- “We’ve got to believe it. We can’t afford not to.” A: We would believe it if we could. B: We should believe it at any price. C: We won’t take the risk of not believing it. D: We won’t allow any hesitation in believing it.
- Since our research so far has not produced any answers to the problem, we need to adopt a different __________ to it.