Although medical science________ control over several dangerous diseases, what worries us is that some of them are returning.
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A
achieved
B
has achieved
C
will achieve
D
had achieved
推荐题目
The result of the experiment was very good, ___________ we hadn’t expected.
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A
as
B
that
C
which
D
what
—How long _______ at this job? —Since 1990.
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A
were you employed
B
have you been employed
C
had you been employed
D
will you be employed
The fans ______ to see the pop singer the whole afternoon, and they won’t leave until he turns up.
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A
have been waiting
B
waited
C
had waited
D
would have waited
John and I＿＿friends for eight years. We first got to know each other at a Christmas party. But we＿＿ each other a couple of times before that.
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A
had been； have met
B
have been； have met
C
had been； had met
D
have been； had met