Mary speaks in a low voice; is difficult to know what she is saying.A.itB.thatC.
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Mary speaks in a low voice; ____ is difficult to know what she is saying.
A.it
B.that
C.so
D.she
试题答案
A
Mary speaks in a low voice; ____ is difficult to know what she is saying.
A.it
B.that
C.so
D.she
A