The field research will take Luffy and Steven about two weeks; it will be a long time _______ we _______ again.
#67501
A
before; met
B
since; meet
C
before; meet
D
since; met
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        result it is, you’d better check it in practice yourself.
#67820
A
Whatever obvious a
B
However obvious
C
However obvious a
D
However a obvious
________, it began to rain unexpectedly.
#68281
A
While cleaning the machine
B
To clean the machine
C
He was cleaning the machine
D
While he was cleaning the machine