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【单选题】
纯合的白色南瓜与黄色球状南瓜杂交,F 1 全部是白色南瓜,F 2 杂合的白色球状南瓜有3966株,则F 2 中纯合的黄色南瓜有 。A.
3966株
B.
1983株
C.
1322株
D.
7932株
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【单选题】When I arrived home, my mother____the dinner.
A.
cook
B.
is cooking
C.
was cooking
D.
would cook
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【单选题】When I arrived home, my mother ___the dinner.
A.
cooked
B.
is cooking
C.
was cooking
D.
would cook
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A.
have finished
B.
had finished
C.
finished
D.
will finish
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【单选题】when I arrived home ,my mother ( )the dinner.
A.
cooked
B.
is cooking
C.
was cooking
D.
would cook
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