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【单选题】
Tom as well as his two friends .A.
are worthy of teaching
B.
are worth to teaching
C.
are worth teaching
D.
is worth teaching
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皮皮学刷刷变学霸
举一反三
【单选题】立克次体与细菌的主要区别是（）
A.
立克次体有细胞壁和核糖体
B.
立克次体含有DNA和RNA两种核酸
C.
立克次体以二分裂方式繁殖
D.
立克次体能人工培养
E.
立克次体是严格的细胞内寄生
【简答题】He was made ______ hard. A) to study B) study C) studying D) studied
【单选题】He had studied hard, he would have been able to pass the exam.
A.
He had studied harder
B.
if only he studied more
C.
Had he studied harder
D.
When he studied more
【简答题】He studied very hard all the time because he didn’t want to _____in his studies. A. fall behind B. be left behind C. left behind D. Both A and B
【单选题】He studied hard at school when he was young, ______ contributes to his success in later life.
A.
which
B.
that
C.
what
D.
each of which
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