A.to pay, to keep | B.to paying, to keeping | C.to pay, to keeping | D.paying, keeping |
A.to, to | B.不填, 不填 | C.to, 不填 | D.不填, to |
A.by, to | B.in, to | C.by, for | D.in, for |
A.in | B.to | C.under | D.by |
A.by | B.for | C.of | D.with |
A.for | B.when | C.if | D.whether |
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