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【判断题】
.所有维生素都可以作为辅酶或辅基的前体。A.
正确
B.
错误
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举一反三
【单选题】--What were you up to when she dropped in?--I ______ for a while and ______ some reading.
A.
was playing, was going to do
B.
played, did
C.
had played, was going to do
D.
had played, did
【单选题】—What were you up to when she dropped in?—I ______ for a while and ______ some reading.
A.
was playing, was going to d0
B.
played, did
C.
had played, was going to do
D.
had played, did
【单选题】—What were you up to when she dropped in? —I _____ for a while and _____ some reading. [ ]
A.
had played; was going to do
B.
played; did
C.
was playing; was going to do
D.
had played; did
【单选题】Some people suggest changing the date for the college entrance exams into ______ Saturday and Sunday of the first week of June, which I think is ______ good advice. [ ]
A.
/ ; /
B.
the; the
C.
the; a
D.
the; /
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