c) There mustn't be
d) Mustn't there be
6. Scientists are speculating that _________ life found on the moons that orbit the planet Jupiter.
a) there could be
b) could there be
c) there could be not
d) there needs to be
答案
1) d, 2) b, 3) b, 4) d, 5) b, 6) a.
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