大全17-18求解

1.                             A patient accusing a doctor of malpractice will find it difficult to prove damage if there is a lack of some other doctor to testify about proper medical procedures.fficeffice" />

(A) if there is a lack of some other doctor to testify

(B) unless there will be another doctor to testify

(C) without another doctor’s testimony

(D) should there be no testimony from some other doctor（C）

(E) lacking another doctor to testify

本题为什么选择C呢？？

1.                             A peculiar feature of the embryonic mammalian circulatory system is that in the area of the heart the cells adhere to one another, beating in unison and adopting specialized orientations exclusive of one another.

(A) beating in unison and adopting

(B) they beat in unison while adopting

(C) beat in unison, and adopt

(D) beating in unison yet adopting（D）

(E) even though they beat in unison and adopt

本题我一看到while adopting就选择的它,请问本题如何入手,我是入门,谢谢