In the past decade email (become) ______ one of the most popular means of communication.
第1题
A.because
B.since
C.why
D.while
第2题
A.to become
B.became
C.becoming
D.is becoming
第3题
A.book
B.having booked
C.booking
D.have booked
第4题
A.succeed
B.succeeded
C.have succeeded
D.will succeed
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