She can speak quite fluent English.She ____A.must be in the U.S.A.for some timeB.must have been in the U.S.A.for some timeC.should have been in the U.S.A.for some timeD.may be in the U.S.A.for some time

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She can speak quite fluent English.She ____A.must be in the U.S.A.for some timeB.must have been in the U.S.A.for some timeC.should have been in the U.S.A.for some timeD.may be in the U.S.A.for some time

She can speak quite fluent English.She ____A.must be in the U.S.A.for some timeB.must have been in the U.S.A.for some timeC.should have been in the U.S.A.for some timeD.may be in the U.S.A.for some time
She can speak quite fluent English.She ____
A.must be in the U.S.A.for some time
B.must have been in the U.S.A.for some time
C.should have been in the U.S.A.for some time
D.may be in the U.S.A.for some time

She can speak quite fluent English.She ____A.must be in the U.S.A.for some timeB.must have been in the U.S.A.for some timeC.should have been in the U.S.A.for some timeD.may be in the U.S.A.for some time
B